0:00:02 > 0:00:07It is here. Exactly as you specified.
0:00:09 > 0:00:13- DISTORTED VOICE:- My sources told me you were an exceptional architect.
0:00:13 > 0:00:15I can see they are correct.
0:00:15 > 0:00:17You honour me.
0:00:19 > 0:00:21And what of the builders?
0:00:21 > 0:00:23They have been dealt with.
0:00:27 > 0:00:30Why do you wear that foreign garb?
0:00:30 > 0:00:32Because I am many things.
0:00:32 > 0:00:35Physician. Traveller.
0:00:35 > 0:00:38Alchemist? That's what they say.
0:00:41 > 0:00:42What is in the box?
0:00:42 > 0:00:45My greatest achievement.
0:00:45 > 0:00:50Something that will one day save this fragile kingdom from itself.
0:00:50 > 0:00:53Your secrets are safe here. I hope...
0:00:53 > 0:00:55AH!
0:00:55 > 0:00:57The King thanks you for your service.
0:00:57 > 0:00:59BLADE SLASHES
0:01:01 > 0:01:03HE GASPS
0:01:06 > 0:01:08HE CHOKES
0:01:08 > 0:01:09DOOR CREAKS SHUT
0:01:39 > 0:01:41FOOTSTEPS
0:01:41 > 0:01:45I know you're there. Show yourself.
0:01:50 > 0:01:52Well, who is it?
0:01:52 > 0:01:55Well...I..I don't know. I mean,
0:01:55 > 0:01:58they've been following me for several days.
0:02:00 > 0:02:03Have you ruffled anyone's feathers lately?
0:02:03 > 0:02:05Well, I did have had some rather radical ideas about the
0:02:05 > 0:02:08impact of the Romans on the local textile industry.
0:02:08 > 0:02:10It-it caused a terrible stir.
0:02:10 > 0:02:12That's a no, then.
0:02:12 > 0:02:14Now, there you go.
0:02:14 > 0:02:15Most kind.
0:02:19 > 0:02:20There is one possibility.
0:02:22 > 0:02:24Professor?
0:02:24 > 0:02:26Oh, it may be nothing,
0:02:26 > 0:02:31but I think it all started after I came into possession of this.
0:02:31 > 0:02:33What is it?
0:02:33 > 0:02:36It's the secret diary of the university's architect.
0:02:36 > 0:02:39Which would make it over 300 years old.
0:02:39 > 0:02:41Why would someone be bothering you over a silly old book?
0:02:41 > 0:02:44This is no mere historical document.
0:02:44 > 0:02:46The diary claims that someone in the King's inner circle discovered
0:02:46 > 0:02:51the secret of alchemy - the method of turning base metals into gold.
0:02:51 > 0:02:53Oh, by magic!
0:02:53 > 0:02:54Or science.
0:02:55 > 0:02:59Nowadays, we'd probably call him a chemist, not an alchemist.
0:02:59 > 0:03:02It also claims the secret is hidden at the university.
0:03:02 > 0:03:03Super! Does it say where?
0:03:05 > 0:03:07Not explicitly.
0:03:10 > 0:03:12You look very tired, Professor.
0:03:14 > 0:03:17Feeling like a marked man is wearing me down.
0:03:17 > 0:03:19I don't sleep, I'm not eating properly.
0:03:21 > 0:03:23How can we help?
0:03:42 > 0:03:44DOOR OPENS
0:03:45 > 0:03:47Hargreaves.
0:03:47 > 0:03:51Principal, Professor Ambrose asks if he can borrow the Magister's Key.
0:03:51 > 0:03:53Really? Why?
0:03:53 > 0:03:56He thought it may be the one referred to in the diary.
0:03:56 > 0:03:58An intriguing hypothesis.
0:03:59 > 0:04:01Very well.
0:04:16 > 0:04:18Good luck.
0:04:18 > 0:04:19Thank you, sir.
0:04:23 > 0:04:25They'll have this place destroyed!
0:04:25 > 0:04:26Exactly.
0:04:26 > 0:04:28They should be in the philosophy department,
0:04:28 > 0:04:30yet here they are in pre-16th century theology.
0:04:33 > 0:04:36Excuse me, I wondered if I might have a word with Professor Ambrose?
0:04:36 > 0:04:38Come right in.
0:04:38 > 0:04:41Professor, I tried to get hold of the Principal.
0:04:41 > 0:04:43Oh, why?
0:04:45 > 0:04:48You asked me to speak to him.
0:04:48 > 0:04:50Oh, yes. Of course.
0:04:50 > 0:04:53He's in a meeting all morning, but I'll keep trying.
0:04:53 > 0:04:55Is this to do with the diary?
0:04:57 > 0:04:59You know about that?
0:04:59 > 0:05:03We-we can trust these people. Tell them what's been happening.
0:05:03 > 0:05:06The diary claims that the location of the Alchemist's secret was
0:05:06 > 0:05:10hidden in a riddle given to the King's closest advisors.
0:05:10 > 0:05:12Could they not just have drawn a map?
0:05:12 > 0:05:13Oh, no, no, no!
0:05:13 > 0:05:16This was a time when men of intellect were required to
0:05:16 > 0:05:18- prove their worth. - Well, what's the riddle?
0:05:18 > 0:05:21"The Key to the Lock to the Door."
0:05:21 > 0:05:24The Principal holds an old key as part of his ceremonial items.
0:05:24 > 0:05:26It dates back to the 17th century,
0:05:26 > 0:05:27when the university was built.
0:05:27 > 0:05:30Good idea. We-we should get hold of it.
0:05:30 > 0:05:34I'll try, Professor. A pleasure to meet you all.
0:05:34 > 0:05:35Yes.
0:05:37 > 0:05:41Ladies, have you seen the sights of this magnificent university?
0:05:41 > 0:05:44The great hall, the library, the gardens?
0:05:44 > 0:05:47Oh, how wearisome. Can't we just go and help "Cheekbones" instead?
0:05:47 > 0:05:50No, no. Father Brown is quite right.
0:05:50 > 0:05:53We should see all the sights while we're here.
0:05:56 > 0:05:58Hilary...
0:05:59 > 0:06:03How long have you been having problems with your memory?
0:06:05 > 0:06:07He's losing his mind, isn't he?
0:06:07 > 0:06:11Father Brown or Ambrose? Either way, the answer is yes.
0:06:11 > 0:06:13Oh, that poor man.
0:06:17 > 0:06:19Somebody's forced this.
0:06:21 > 0:06:22THIEF!
0:06:25 > 0:06:29There was a fuss the other day, I was scheduled to give a lecture
0:06:29 > 0:06:30and I...
0:06:30 > 0:06:32I completely forgot.
0:06:33 > 0:06:35It's a cruel trick of nature,
0:06:35 > 0:06:41this brain which made my career, deserting me in my twilight years.
0:06:43 > 0:06:46I think this business with the diary has been playing havoc with
0:06:46 > 0:06:48my nerves.
0:06:51 > 0:06:52Who found it?
0:06:54 > 0:06:56Timothy Hargreaves.
0:06:56 > 0:06:58The boy who was here earlier.
0:06:58 > 0:07:01He wanted me to confirm that it was... That it was authentic.
0:07:02 > 0:07:05Does anyone else know about it?
0:07:05 > 0:07:07Just the Principal.
0:07:07 > 0:07:11We're keeping quiet until the official announcement.
0:07:12 > 0:07:15The person who has been following you...
0:07:15 > 0:07:17Yes...?
0:07:19 > 0:07:22Do you think you might be imagining it?
0:07:22 > 0:07:23I know what I saw!
0:07:27 > 0:07:30Once again - we didn't do anything.
0:07:30 > 0:07:32I can repeat it in French if it will get the message across.
0:07:32 > 0:07:35Oh, just doing a spot of spring cleaning, were you?
0:07:35 > 0:07:37- Not really my department. - What's going on here?
0:07:37 > 0:07:39I discovered these intruders trying to break into the
0:07:39 > 0:07:41trophy cabinet.
0:07:41 > 0:07:46We are not intruders, we are friends of Professor Ambrose.
0:07:46 > 0:07:49This porter of yours has got the wrong end of the stick.
0:07:49 > 0:07:50I caught them red-handed.
0:07:50 > 0:07:53Please, let us not descend into squabbling.
0:07:53 > 0:07:57Penelope Windermere, The Countess of Montague's niece. How do you do?
0:07:57 > 0:07:59Malcolm Pendle, Principal.
0:07:59 > 0:08:02We were just admiring this marvellous hall and we
0:08:02 > 0:08:05noticed someone had broken the lock.
0:08:05 > 0:08:07There's nothing of any real value here.
0:08:07 > 0:08:10We just dug out whatever cups and medals we could find,
0:08:10 > 0:08:13to celebrate 100 years of the university athletic team.
0:08:13 > 0:08:15Anything been taken?
0:08:15 > 0:08:16One of the old medals has gone.
0:08:19 > 0:08:21I am fed up with these student pranks.
0:08:21 > 0:08:23I believe this is a police matter.
0:08:23 > 0:08:27We're not calling the police for the sake of a piece of old tin!
0:08:28 > 0:08:32Obviously these ladies had nothing whatever to do with what happened here.
0:08:32 > 0:08:36And as friends of Professor Ambrose, we must extend them every courtesy.
0:08:36 > 0:08:38If you insist.
0:08:38 > 0:08:40I do.
0:08:40 > 0:08:44Now, if you'll excuse me, ladies, I have business to attend to.
0:08:49 > 0:08:52The professors may think there's a golden aura around you but I
0:08:52 > 0:08:54see you for what you are.
0:08:54 > 0:08:56We could have made a great team.
0:08:56 > 0:08:58Just think, with my looks and your hostility,
0:08:58 > 0:09:01just think how successful our children would be.
0:09:04 > 0:09:06That's the problem with pretty boys -
0:09:06 > 0:09:09their charms only last till they get what they want.
0:09:09 > 0:09:13What on earth goes on inside that head of yours?
0:09:19 > 0:09:21"The Key to the Lock to the Door."
0:09:24 > 0:09:25Key. Lock. Door.
0:09:27 > 0:09:30Door, lock, key?
0:09:30 > 0:09:32Professor, do you have any milk?
0:09:32 > 0:09:35DOOR OPENS AND CLOSES
0:09:35 > 0:09:37THUD
0:10:03 > 0:10:07Hello, Timothy? Is Professor Ambrose with you?
0:10:08 > 0:10:10Hello?
0:10:30 > 0:10:32Have you got the diary?
0:10:33 > 0:10:36It-it-it's gone.
0:10:36 > 0:10:38Professor, are you all right?
0:10:38 > 0:10:41I'm very well, thank you very much. And yourself?
0:10:41 > 0:10:42Is this chap bothering you?
0:10:42 > 0:10:44I stopped him going in the water. Again.
0:10:44 > 0:10:47Where has Father Brown got to?
0:10:47 > 0:10:48Who?
0:10:48 > 0:10:53Professor Ambrose thinks he may have lost something. An old diary.
0:10:53 > 0:10:54Oh, yes?
0:10:54 > 0:10:56It's valuable.
0:10:56 > 0:10:58Well, WE haven't seen it.
0:10:58 > 0:11:00Professor, let's get you back to your rooms.
0:11:00 > 0:11:03- Thank you. - That's it.
0:11:03 > 0:11:05Look after him.
0:11:11 > 0:11:12Requiescat in pace.
0:11:14 > 0:11:15Amen.
0:11:19 > 0:11:21Hello.
0:11:21 > 0:11:26What's happened? Is..is that Timothy?
0:11:26 > 0:11:28Is... Is he...?
0:11:28 > 0:11:29Yes.
0:11:35 > 0:11:39I wonder if you'll be on the scene as quickly when I drop dead, Padre?
0:11:40 > 0:11:42Have some respect.
0:11:42 > 0:11:45Please, Father, into the corridor.
0:11:49 > 0:11:51What ARE you doing here?
0:11:53 > 0:11:55I was looking for a friend of mine.
0:11:57 > 0:11:58And you are?
0:11:58 > 0:12:01- I'm just passing. I'll be off. - I don't think so.
0:12:01 > 0:12:03Name?
0:12:03 > 0:12:04Victoria Nicholson.
0:12:04 > 0:12:08Thank goodness you're here. My secretary told me what's happened.
0:12:08 > 0:12:10Oh, my...
0:12:10 > 0:12:13It's quite a little party we're gathering.
0:12:13 > 0:12:16I'm Malcolm Pendle, Principal of the university.
0:12:16 > 0:12:19Please, tell me anything that I can do to help.
0:12:19 > 0:12:20Do you have a spare room we can use?
0:12:20 > 0:12:23Can't have everyone standing around out here.
0:12:23 > 0:12:25Biology labs are just around the corner.
0:12:25 > 0:12:27- I have a seminar to get to. - You'll have to miss it.
0:12:27 > 0:12:30No. I had to fight hard to get here.
0:12:30 > 0:12:32I'm not going to start missing classes.
0:12:32 > 0:12:33I'll inform your tutors,
0:12:33 > 0:12:37make sure they fill you in on whatever you miss.
0:12:37 > 0:12:39So, you found the body, Padre?
0:12:40 > 0:12:44Yes, I did. He couldn't have been there long.
0:12:45 > 0:12:48He came to see Professor Ambrose about an hour ago.
0:12:48 > 0:12:51That must have been soon after he left my office.
0:12:51 > 0:12:55He wanted to borrow the Magister's Key.
0:12:55 > 0:12:56The what?
0:12:56 > 0:12:58It's a ceremonial item,
0:12:58 > 0:13:02something that gets handed down when somebody new assumes my post.
0:13:02 > 0:13:05But he told us that he couldn't find you.
0:13:05 > 0:13:08Are you sure he had this key?
0:13:08 > 0:13:09Oh, absolutely.
0:13:09 > 0:13:12Well, he hasn't got it now. His pockets are empty.
0:13:13 > 0:13:15This way.
0:13:19 > 0:13:20Will this do?
0:13:23 > 0:13:26Yes. We need to take statements.
0:13:26 > 0:13:27SNAKE HISSES
0:13:27 > 0:13:28What is that doing here?!
0:13:28 > 0:13:30Professor Griffin believes in a hands-on approach
0:13:30 > 0:13:32to teaching biology.
0:13:34 > 0:13:37Looks like you've made a friend.
0:13:37 > 0:13:40Just stay in here and keep out of my way, Padre.
0:13:40 > 0:13:41Do you need me?
0:13:41 > 0:13:45If not, I should telephone and offer my sympathies to the boy's parents.
0:13:45 > 0:13:47Fine.
0:13:50 > 0:13:52The sergeant will be through to take your statements.
0:13:52 > 0:13:54I didn't see anything.
0:14:04 > 0:14:05Were you close to Timothy?
0:14:07 > 0:14:10Not really. We had some history classes together.
0:14:14 > 0:14:16Did he ever mention an old diary?
0:14:18 > 0:14:20No.
0:14:24 > 0:14:26I'm afraid this area is out of bounds, sir.
0:14:26 > 0:14:28I heard what happened.
0:14:28 > 0:14:31I've been porter at this university for over three decades.
0:14:31 > 0:14:33I know what goes on here better than anybody.
0:14:33 > 0:14:35Is that so?
0:14:35 > 0:14:38Then, can you think of anyone who might have done this?
0:14:40 > 0:14:43He's moved them again. While I was out.
0:14:43 > 0:14:45Oh, look.
0:14:45 > 0:14:47What have you got there?
0:14:47 > 0:14:49There you are, thank goodness.
0:14:49 > 0:14:51And what's HE doing here?
0:14:53 > 0:14:58The boy we met earlier, Timothy Hargreaves...
0:14:59 > 0:15:02- He's been murdered.- Oh!
0:15:07 > 0:15:12Professor... is that yours?
0:15:12 > 0:15:14Ah, no, no.
0:15:14 > 0:15:16I believe this belongs to the... to the Principal.
0:15:16 > 0:15:19The last time anyone saw that key, Hargreaves had it.
0:15:19 > 0:15:21So how did it get here?
0:15:21 > 0:15:23He found it. I saw just him.
0:15:23 > 0:15:25Maybe that's what he wants you to think.
0:15:25 > 0:15:29I gather he's been prone to sudden mood shifts recently.
0:15:29 > 0:15:31Only this morning, he was seen wandering around the college,
0:15:31 > 0:15:33lost and confused.
0:15:33 > 0:15:34Oh, yes, and who told you that?
0:15:34 > 0:15:36I think we can guess.
0:15:36 > 0:15:38It all paints a pretty vivid picture.
0:15:39 > 0:15:44Professor Ambrose means no harm to anyone.
0:15:44 > 0:15:46I just go where the evidence leads me.
0:15:52 > 0:15:55Timothy Hargreaves had a cut on his cheek.
0:15:55 > 0:15:58Have you considered how he got it?
0:15:58 > 0:15:59In the struggle.
0:16:02 > 0:16:07In a struggle, Timothy would have easily overpowered him.
0:16:10 > 0:16:12Oh, what's happening?
0:16:13 > 0:16:17Hilary Ambrose, I am arresting you for the murder of
0:16:17 > 0:16:18Timothy Hargreaves.
0:16:18 > 0:16:21You are not obliged to say anything unless you wish to do so,
0:16:21 > 0:16:25but whatever you say may be written down and given in evidence.
0:16:27 > 0:16:29We need to find out who framed him.
0:16:29 > 0:16:31Are you sure that's what happened?
0:16:31 > 0:16:34I mean, the Professor hasn't been himself lately.
0:16:35 > 0:16:37Professor Ambrose is my friend.
0:16:37 > 0:16:41Oh, there was that girl having some kind of disagreement with Timothy.
0:16:41 > 0:16:44Disagreement? She slapped him into tomorrow.
0:16:45 > 0:16:46Dark hair?
0:16:46 > 0:16:48About five foot five?
0:16:48 > 0:16:49You've met her?
0:16:49 > 0:16:53Whoever planted the key in Ambrose's room knew the significance of
0:16:53 > 0:16:55the riddle.
0:16:55 > 0:16:58We need to find out how many people know about the diary.
0:16:58 > 0:17:00Well, that porter swine for one.
0:17:00 > 0:17:02He asked if we'd seen it.
0:17:02 > 0:17:04Where is it now? Do the police have it?
0:17:09 > 0:17:10HE CLEARS THROAT
0:17:10 > 0:17:12I may have accidentally borrowed it.
0:17:12 > 0:17:15Professor Ambrose left it when he disappeared.
0:17:15 > 0:17:19That's awfully sly of you, Father. I do approve.
0:17:19 > 0:17:22Mrs McCarthy, will you talk to the porter?
0:17:22 > 0:17:25Find out what he knows about it.
0:17:25 > 0:17:27I'll give him a piece of my mind.
0:17:27 > 0:17:31How could he tell the Inspector that Ambrose was losing the plot?
0:17:31 > 0:17:34The main thing is to find out what he knows.
0:17:36 > 0:17:38- We'll meet back here. - Right.
0:17:44 > 0:17:46KNOCK ON DOOR
0:17:47 > 0:17:49May I have a word?
0:17:49 > 0:17:50Father Brown, do.
0:17:53 > 0:17:56The police told me about Professor Ambrose.
0:17:56 > 0:18:00Please let me know if there's anything that I can do to help.
0:18:00 > 0:18:02I don't think he's responsible for what happened.
0:18:02 > 0:18:04Well, I know it must be hard to accept,
0:18:04 > 0:18:07but the police seemed quite convinced.
0:18:07 > 0:18:12Timothy lied to Ambrose, pretending he didn't have the key.
0:18:13 > 0:18:19Hargreaves was a talented undergraduate but not without ego.
0:18:20 > 0:18:24Perhaps he was hoping to solve the riddle for himself.
0:18:26 > 0:18:29Has anyone ever tried to see where the key fits?
0:18:29 > 0:18:32My wife took an interest a few years ago.
0:18:32 > 0:18:36Tried the key in every lock in the university, but without success.
0:18:36 > 0:18:39Would it be possible to speak with her?
0:18:39 > 0:18:42She passed away. 18 months ago.
0:18:44 > 0:18:46I'm very sorry.
0:18:46 > 0:18:50Struck down by her own failing body before her time.
0:18:50 > 0:18:53Such a... Such a pointless waste.
0:18:55 > 0:18:58When things like that happen, God...
0:18:58 > 0:19:01With respect, I think it's too late for God to help her now.
0:19:03 > 0:19:05That's rather magnificent.
0:19:07 > 0:19:09It's the original plan for the university.
0:19:09 > 0:19:12Now, if you'll excuse me, I have a lot to sort out.
0:19:16 > 0:19:17Yes, of course.
0:19:19 > 0:19:21Thank you.
0:19:22 > 0:19:24Now, the boy had the key,
0:19:24 > 0:19:28then he died and somehow it ended up in your room.
0:19:28 > 0:19:30Just explain that to me.
0:19:30 > 0:19:32I don't know.
0:19:32 > 0:19:38The porter said he saw you wandering around in a daze this morning.
0:19:39 > 0:19:42What can you tell me about that?
0:19:42 > 0:19:45Oh... I can't remember!
0:19:47 > 0:19:51I'll be honest - if you don't give me something to work with,
0:19:51 > 0:19:52then I can't help you.
0:19:54 > 0:19:56Did I hurt that poor boy?
0:19:58 > 0:20:03As things stand... I have to say it looks that way.
0:20:04 > 0:20:07Oh... How shall I live with myself?
0:20:09 > 0:20:12Perhaps confessing would help ease the burden?
0:20:14 > 0:20:16SINISTER MUSIC
0:20:16 > 0:20:18DRAUGHT OF AIR
0:20:18 > 0:20:19He's here!
0:20:21 > 0:20:22Who?
0:20:22 > 0:20:24The shadow was...
0:20:24 > 0:20:27Well, perhaps he could wait outside while we finish up?
0:20:38 > 0:20:40Hurry, before he comes back.
0:20:40 > 0:20:42I was right!
0:20:42 > 0:20:43Oh, but of course.
0:20:43 > 0:20:46We couldn't even find that porter, but you managed to solve the
0:20:46 > 0:20:50murder and crack a 300-year-old mystery while we were gone?
0:20:50 > 0:20:53No, no, but I think I understand the riddle.
0:20:55 > 0:20:59"The Key to the Lock to the Door", refers to three separate puzzles.
0:20:59 > 0:21:01The key, the lock and the door.
0:21:02 > 0:21:05But if the killer was trying to solve it, then why leave the
0:21:05 > 0:21:07Magister's Key in Ambrose's room?
0:21:07 > 0:21:09Wouldn't they need it?
0:21:09 > 0:21:11Not if they knew what they were looking for.
0:21:14 > 0:21:16Here.
0:21:19 > 0:21:20The key!
0:21:23 > 0:21:26The architect who drew this also helped to design the riddle.
0:21:29 > 0:21:32The symbols over the buildings are referred to in the key with
0:21:32 > 0:21:34one exception...
0:21:36 > 0:21:38The library.
0:21:42 > 0:21:43I don't know how...
0:21:46 > 0:21:50..trying to solve an ancient riddle is going to help Ambrose.
0:21:55 > 0:21:57If the real killer is attempting to do the same,
0:21:57 > 0:22:00then that will lead us to him.
0:22:01 > 0:22:02Or her.
0:22:05 > 0:22:07Is that the girl you saw talking to Timothy?
0:22:09 > 0:22:10I'll see you in a moment.
0:22:16 > 0:22:17Miss Nicholson...
0:22:19 > 0:22:21..may I have a word?
0:22:21 > 0:22:22I have a lecture to get to.
0:22:28 > 0:22:33My friends say they saw you with Timothy, just before he died.
0:22:33 > 0:22:36Apparently you were rather upset with him.
0:22:39 > 0:22:41Yes, I was angry with him.
0:22:43 > 0:22:47We had a brief, misguided fling that ended badly.
0:22:49 > 0:22:51This place, Thorndike...
0:22:52 > 0:22:54How do you know about it?
0:22:54 > 0:22:56I don't know what you mean.
0:23:03 > 0:23:07It's mentioned in this diary that you said you knew nothing about.
0:23:10 > 0:23:12When did Timothy let you read it?
0:23:12 > 0:23:15Look, he wasn't the one who found it. I did.
0:23:15 > 0:23:17Ah...
0:23:18 > 0:23:20Where?
0:23:20 > 0:23:23I was going through the university land deeds for my history project.
0:23:23 > 0:23:26I showed Timothy, and he stole it from me.
0:23:27 > 0:23:31I know there was no love lost between you and Timothy,
0:23:31 > 0:23:36but I believe that Professor Ambrose is being framed for his death.
0:23:36 > 0:23:42And in order to help him, I need to understand what is in that diary.
0:23:42 > 0:23:44And that is my ONLY interest in it.
0:23:47 > 0:23:48So...
0:23:50 > 0:23:51..Thorndike...
0:23:58 > 0:23:59Here.
0:24:02 > 0:24:05"In Thorndike the Alchemist's magic has been proven.
0:24:05 > 0:24:09"The King's enemies will bend their knee before him."
0:24:11 > 0:24:14This is a reproduction of a map from 1603.
0:24:14 > 0:24:16The village of Thorndike is here,
0:24:16 > 0:24:19a few miles from where the university is now.
0:24:20 > 0:24:23But this one, nearly 100 years later...
0:24:27 > 0:24:28It's gone.
0:24:30 > 0:24:32Where did it go?
0:24:32 > 0:24:34I don't know.
0:24:45 > 0:24:47What have you found?
0:24:48 > 0:24:49Absolutely nothing.
0:24:52 > 0:24:53Oh.
0:24:53 > 0:24:55The architect wanted his riddle to be solved...
0:24:57 > 0:25:01..but a book in a public place is liable to go missing.
0:25:02 > 0:25:05Perhaps he factored that into his design.
0:25:05 > 0:25:07And what's that supposed to mean?
0:25:07 > 0:25:11Maybe we're looking for something more permanent.
0:25:11 > 0:25:14Yes, and maybe we're just looking in the wrong place.
0:25:19 > 0:25:21Those marks look recent.
0:25:29 > 0:25:30SCRAPING
0:25:46 > 0:25:47Why the long face?
0:25:47 > 0:25:50This may sound strange...
0:25:50 > 0:25:52Coming from you?
0:25:52 > 0:25:56Mrs McCarthy, don't make any sudden moves and move slowly towards me.
0:25:59 > 0:26:00Why?
0:26:03 > 0:26:06He's magnificent!
0:26:06 > 0:26:08Is that thing poisonous?
0:26:08 > 0:26:09I'm not sure.
0:26:10 > 0:26:12How will we get past?
0:26:12 > 0:26:14Perhaps we should feed it something.
0:26:15 > 0:26:16That's a good idea.
0:26:17 > 0:26:19If we had a mouse...
0:26:19 > 0:26:23Oh, yes, of course, I'll go to the mouse dispenser, shall I?
0:26:23 > 0:26:29Or, um, we could distract it and then get behind it and pick it up
0:26:29 > 0:26:31by the neck.
0:26:31 > 0:26:33It's all neck!
0:26:33 > 0:26:36The bit behind the head. I don't know what it's called.
0:26:36 > 0:26:38And how exactly are we going to do that?
0:26:40 > 0:26:41Where do you want him?
0:26:43 > 0:26:44Buiochas le Dia.
0:26:46 > 0:26:49He reminds me of this splendid specimen we found while on
0:26:49 > 0:26:51safari in Kenya.
0:26:51 > 0:26:52I used to call him Hugh.
0:26:52 > 0:26:53Do we have to return him?
0:26:53 > 0:26:55There's that porter.
0:26:57 > 0:26:58I'll catch you up.
0:27:14 > 0:27:17Are you looking for this?
0:27:17 > 0:27:18How did you get that?
0:27:19 > 0:27:22How did you find out about the existence of the diary?
0:27:23 > 0:27:27Ambrose has been asking questions around the university.
0:27:27 > 0:27:29I realised then that he was trying to solve
0:27:29 > 0:27:32the Alchemist's riddle again.
0:27:32 > 0:27:34Again?
0:27:34 > 0:27:38When Ambrose came to this university, 30-odd years ago,
0:27:38 > 0:27:43he found the riddle in some old correspondence with the royal court.
0:27:43 > 0:27:45He never told me.
0:27:45 > 0:27:47He'd probably forgotten.
0:27:47 > 0:27:49I don't know what he did with those letters, but when Timothy
0:27:49 > 0:27:54gave him that diary, well, he started that search all over again.
0:27:54 > 0:27:58I tried to take it from him, but he wouldn't let it out of his sight.
0:27:58 > 0:28:00He thought you were a phantom!
0:28:00 > 0:28:04When Ambrose first tried to solve the riddle, well,
0:28:04 > 0:28:06he became obsessed.
0:28:07 > 0:28:08Then what happened?
0:28:09 > 0:28:13One day, he just stopped searching.
0:28:13 > 0:28:17But he had a look in his eyes that I haven't seen since the trenches.
0:28:18 > 0:28:20Absolute, helpless fear.
0:28:21 > 0:28:23And I don't want him to rediscover why.
0:28:24 > 0:28:28You told the police he'd been behaving erratically.
0:28:28 > 0:28:30It's the truth.
0:28:30 > 0:28:33But what you said could have him hanged.
0:28:34 > 0:28:36I like Ambrose,
0:28:36 > 0:28:40but if he's responsible, then Timothy's family deserve justice.
0:28:43 > 0:28:44Now, give me the diary...
0:28:46 > 0:28:48..and I will destroy it.
0:28:49 > 0:28:54I can't. Because the information in this could save my friend.
0:28:59 > 0:29:00Make it quick.
0:29:00 > 0:29:03A few Hail Marys, then I want you out of here.
0:29:07 > 0:29:09DOOR CREAKS
0:29:09 > 0:29:11LOCK RATTLES
0:29:11 > 0:29:15Hello, my friend. How are you?
0:29:17 > 0:29:19Please tell me the truth.
0:29:20 > 0:29:21Did I kill him?
0:29:21 > 0:29:23No.
0:29:23 > 0:29:25Would you swear that on the Bible?
0:29:26 > 0:29:27Oh.
0:29:28 > 0:29:29He's followed me here.
0:29:34 > 0:29:35Whom?
0:29:35 > 0:29:38The Alchemist, with his beaked mask
0:29:38 > 0:29:43and his-his...magic.
0:29:44 > 0:29:49We found a carving in the library of Janus's head.
0:29:49 > 0:29:53One side facing towards the future, one side facing towards the past.
0:29:53 > 0:29:55Yes, Janus, the God of transitions.
0:29:55 > 0:30:00He acts as a barrier between this place and the next.
0:30:01 > 0:30:03Isn't he also the God of Doors?
0:30:05 > 0:30:09One of his faces was on the medal, it was all bathed in moonlight.
0:30:11 > 0:30:13That was the King's copy.
0:30:13 > 0:30:16I threw it in the lake. A long time ago.
0:30:17 > 0:30:18Why?
0:30:19 > 0:30:22Oh, no. Oh, please.
0:30:24 > 0:30:26Help! Help!
0:30:26 > 0:30:27LOCK RATTLES
0:30:27 > 0:30:29HE SOBS
0:30:29 > 0:30:32Out, Padre. You're upsetting him.
0:30:32 > 0:30:33He shouldn't be left alone.
0:30:33 > 0:30:35Out!
0:30:52 > 0:30:56I had to tell him all I knew. He's my friend.
0:31:13 > 0:31:15No! No!
0:31:15 > 0:31:21What did Professor Ambrose know about the carving in the library?
0:31:21 > 0:31:25He said he saw one of the faces on a medal.
0:31:25 > 0:31:29Well, there was a medal stolen from the display case in the Great Hall.
0:31:29 > 0:31:33Professor Ambrose said he'd thrown it into the lake a long time ago.
0:31:33 > 0:31:37Yet the display case wasn't broken into until this morning.
0:31:41 > 0:31:45Well, can't sit around here all day drinking tea.
0:31:45 > 0:31:47Hooray for that! What are we going to do?
0:31:47 > 0:31:51I'm going to shake the tree and see what falls out.
0:31:58 > 0:32:00You wanted to see me, Principal.
0:32:02 > 0:32:03Actually, that was me.
0:32:03 > 0:32:06I'm glad you could join us, thank you.
0:32:06 > 0:32:09Make yourself at home.
0:32:11 > 0:32:12KNOCK ON DOOR
0:32:12 > 0:32:15Not now, girl. This isn't a good moment.
0:32:15 > 0:32:19And I asked Victoria if she could join us as well.
0:32:19 > 0:32:20Do come in.
0:32:22 > 0:32:23What's going on?
0:32:26 > 0:32:29As far as I know, you are the only members of the university who
0:32:29 > 0:32:32know about the existence of the diary.
0:32:33 > 0:32:35What of it?
0:32:35 > 0:32:39Ever since it showed up, a kind of madness has descended.
0:32:41 > 0:32:45I propose that we work together to solve the puzzle.
0:32:47 > 0:32:53And then whoever killed Timothy will have no reason to harm anyone else.
0:32:53 > 0:32:56Are you saying one of us murdered him?
0:32:57 > 0:33:01I think we should all just forget we ever heard this cursed riddle.
0:33:01 > 0:33:02I don't think that's very likely.
0:33:02 > 0:33:05Sorry if I'm being naive,
0:33:05 > 0:33:08but how do you fit into this?
0:33:08 > 0:33:11I have some crucial information the rest of you don't.
0:33:11 > 0:33:13Something Ambrose told me.
0:33:13 > 0:33:17But to use it I need the medal that was stolen from the Great Hall.
0:33:21 > 0:33:25Ambrose told me that he got rid of the King's medal.
0:33:27 > 0:33:32But I think there was another medal that showed Janus's other head.
0:33:34 > 0:33:37I think that belonged to the Alchemist.
0:33:51 > 0:33:52Thank you.
0:33:53 > 0:33:55What do the medals do?
0:33:55 > 0:34:01On the medal Ambrose threw into the lake, Janus was looking at the moon.
0:34:02 > 0:34:06In this one, he's looking at the sun.
0:34:15 > 0:34:17What's he doing?
0:34:17 > 0:34:20It marks the journey from night to day.
0:34:29 > 0:34:30Now what?
0:34:36 > 0:34:39It's at the wrong angle to tell the time now.
0:34:39 > 0:34:41But now it's telling us something else.
0:34:41 > 0:34:42Where's it pointing?
0:34:45 > 0:34:47The Great Hall.
0:34:50 > 0:34:52Over there.
0:34:55 > 0:34:58Here! There's... There's a catch.
0:34:58 > 0:34:59Don't!
0:34:59 > 0:35:00Nothing good will come of this.
0:35:00 > 0:35:02It's too late, Crawford.
0:35:02 > 0:35:03Look.
0:35:03 > 0:35:05CREAKING
0:35:24 > 0:35:25Look.
0:35:30 > 0:35:32Here, use my matches.
0:35:34 > 0:35:35Wait.
0:35:41 > 0:35:42This way.
0:35:46 > 0:35:50Looks like something's been burnt. Most probably paper.
0:35:57 > 0:35:59Something's wrong.
0:35:59 > 0:36:01That lantern's too modern.
0:36:01 > 0:36:02Open the box.
0:36:04 > 0:36:05Stop.
0:36:06 > 0:36:08Listen to the priest.
0:36:10 > 0:36:11Give it here.
0:36:18 > 0:36:20Haven't you done enough damage?
0:36:20 > 0:36:21What do you mean?
0:36:21 > 0:36:26I think you found the carving in the library this morning.
0:36:28 > 0:36:30You knew that I was on the right trail.
0:36:32 > 0:36:36But when you remembered where you'd seen Janus's face before
0:36:36 > 0:36:37it was too late.
0:36:39 > 0:36:40The medal had gone.
0:36:42 > 0:36:46Ambrose was always very open about his investigation
0:36:46 > 0:36:50so he would have told you anything he'd found,
0:36:50 > 0:36:54and you reasoned Timothy must have taken it.
0:36:55 > 0:36:56But I had the medal.
0:36:56 > 0:36:58Yes.
0:36:59 > 0:37:03You killed Timothy Hargreaves because you mistakenly thought
0:37:03 > 0:37:06he was the only other person who knew about the medal.
0:37:08 > 0:37:09Is this true?
0:37:12 > 0:37:13I didn't want to hurt him.
0:37:15 > 0:37:18'I waited in his room till he came back.'
0:37:21 > 0:37:22What are you doing?
0:37:22 > 0:37:23Shut the door.
0:37:23 > 0:37:25'I lost my temper.'
0:37:25 > 0:37:28- Where is it?- What?
0:37:29 > 0:37:30The medal.
0:37:31 > 0:37:33I don't know what you're talking about.
0:37:34 > 0:37:37I won't ask again. The medal!
0:37:38 > 0:37:39You hit me.
0:37:39 > 0:37:40Don't test my patience!
0:37:41 > 0:37:45I'll make sure people know about this. Father will tell everyone.
0:37:45 > 0:37:46Give it to me!
0:37:46 > 0:37:49You're finished. I'll have your job. Take everything you....
0:37:56 > 0:37:58I swear I didn't mean to do it.
0:37:58 > 0:38:01But the next thing you did was quite deliberate.
0:38:04 > 0:38:08You planted the key in Professor Ambrose's room.
0:38:08 > 0:38:10I panicked.
0:38:10 > 0:38:13I knew that anyone investigating would discover Ambrose's interest
0:38:13 > 0:38:15in the riddle, so it would be easy to lay the blame at his feet.
0:38:15 > 0:38:18But I thought because of his condition, no-one would try
0:38:18 > 0:38:19to prosecute him.
0:38:19 > 0:38:21You took advantage of an ill man.
0:38:21 > 0:38:24I've done wrong. I know that.
0:38:24 > 0:38:25But I mean to make up for it.
0:38:25 > 0:38:29That's convenient, now you've been found out.
0:38:29 > 0:38:31What's done is done.
0:38:31 > 0:38:36Think of all the good I could do with what we've found here.
0:38:36 > 0:38:40Um...Principal, there is no gold.
0:38:42 > 0:38:43What?
0:38:44 > 0:38:46Professor Ambrose has already been here.
0:38:49 > 0:38:51This is his lantern.
0:38:52 > 0:38:55He discovered the secret 30 years ago.
0:39:00 > 0:39:02He burnt these papers.
0:39:03 > 0:39:06Because he didn't want anyone to know what they contained.
0:39:06 > 0:39:08The idiot!
0:39:08 > 0:39:10Why didn't he take the box?
0:39:11 > 0:39:14Because he feared that what it contained was too dangerous
0:39:14 > 0:39:15to be removed.
0:39:15 > 0:39:19No. He's wrong.
0:39:22 > 0:39:26I beg you, Principal, I beg you, do not go any further.
0:39:29 > 0:39:32Professor Ambrose talked about a man in a beaked mask.
0:39:34 > 0:39:35Like a plague doctor?
0:39:36 > 0:39:39Yes, exactly.
0:39:41 > 0:39:47I think the Alchemist worked out how to use a plague as a weapon.
0:39:48 > 0:39:50And that was his secret.
0:39:50 > 0:39:54That's where the village of Thorndike went!
0:39:54 > 0:39:57It disappears from maps cos there was no-one left alive.
0:39:57 > 0:39:59It's where he tested it.
0:39:59 > 0:40:00Lies.
0:40:00 > 0:40:01No!
0:40:01 > 0:40:03Keep away.
0:40:05 > 0:40:11What if the box contains the last remaining samples of
0:40:11 > 0:40:13the Alchemist's experiment?
0:40:14 > 0:40:19It would kill the four of us at the very least.
0:40:21 > 0:40:23I have to know the truth.
0:40:23 > 0:40:24But you're better than that.
0:40:24 > 0:40:26It's too late to save me.
0:40:26 > 0:40:28God will forgive you.
0:40:28 > 0:40:29But I won't.
0:40:32 > 0:40:34Is this what your wife would have wanted?
0:40:36 > 0:40:39That our loved ones suffer the same pain that you did.
0:40:50 > 0:40:52I thought I could have done so much good with it.
0:41:27 > 0:41:31This secret must remain buried. Are we all agreed?
0:41:31 > 0:41:33- Yes.- I promise.
0:41:34 > 0:41:37What do we do with him?
0:41:39 > 0:41:43We cannot explain anything to the police without telling them
0:41:43 > 0:41:45what we found.
0:41:45 > 0:41:50I know what I have to do, but I'm a coward.
0:41:51 > 0:41:53How will you live with yourself?
0:41:55 > 0:41:57I'm afraid of what they'll do to me.
0:41:59 > 0:42:03Can you return to your former life after what's happened?
0:42:06 > 0:42:09You have already taken the first step.
0:42:11 > 0:42:13The hardest part is behind you.
0:42:19 > 0:42:20LOCK RATTLES
0:42:22 > 0:42:28Professor, we're letting you go. We need this cell.
0:43:10 > 0:43:14Which of these books are essential for you to take with you?
0:43:14 > 0:43:15I'd start with those and then...
0:43:15 > 0:43:18there's my Divinity section.
0:43:18 > 0:43:19And the diary, of course.
0:43:23 > 0:43:25Hilary, it's gone.
0:43:26 > 0:43:28Oh, that's such a shame.
0:43:31 > 0:43:35So, what will you do in your retirement?
0:43:36 > 0:43:38I'll try and keep out of trouble.
0:43:38 > 0:43:41And my brother has a project he wants my opinion on.
0:43:41 > 0:43:42Oh, what is it?
0:43:42 > 0:43:44Something of a mystery at his local church.
0:43:44 > 0:43:47I'm not sure you should get involved with that.
0:43:47 > 0:43:49Don't be ridiculous, I can't wait!
0:43:49 > 0:43:52There's a missing priest, a stolen crucifix from the Middle Ages,
0:43:52 > 0:43:55and a trail leading from the altar.
0:43:55 > 0:43:58I think I shall enjoy retirement.