0:00:05 > 0:00:05The car is registered to a Greta Pritchard,
0:00:05 > 0:00:07a primary school teacher at Plas Y Dderwen School
0:00:07 > 0:00:09in the village of Glanrhyd.
0:00:09 > 0:00:11That is not Greta.
0:00:11 > 0:00:12That is not my daughter.
0:00:12 > 0:00:14One dead, one missing.
0:00:14 > 0:00:16I didn't kill this girl
0:00:16 > 0:00:18and I don't know...
0:00:18 > 0:00:19where Greta is.
0:00:22 > 0:00:24'When I saw Kasia's body,'
0:00:24 > 0:00:26I panicked.
0:00:26 > 0:00:27Some place.
0:00:27 > 0:00:28The owner died of a broken heart.
0:00:28 > 0:00:30It's been empty ever since.
0:00:30 > 0:00:32Never know what goes on in people's heads.
0:00:32 > 0:00:35Were you and Greta close? Not like her and Rhian.
0:00:41 > 0:00:42Do you speak English?
0:00:42 > 0:00:46What have you got on Prosser that keeps him so close to you?
0:00:46 > 0:00:47Stay away from me.
0:01:02 > 0:01:04RECORDING: 'Why did you run?'
0:01:05 > 0:01:07'I was frightened.'
0:01:10 > 0:01:12Was Kasia your friend?
0:01:14 > 0:01:16Best friends...
0:01:16 > 0:01:18since when we were little.
0:01:19 > 0:01:22Did you come to the UK together?
0:01:22 > 0:01:23No.
0:01:24 > 0:01:26Kasia came first...
0:01:26 > 0:01:27six months ago.
0:01:29 > 0:01:31I have only been here for three weeks.
0:01:31 > 0:01:32DOOR OPENING
0:01:37 > 0:01:38DOOR CLOSING
0:01:39 > 0:01:40Bronka.
0:01:43 > 0:01:44DCI Mathias.
0:01:47 > 0:01:50There's no need to be afraid. I thought you were going to hurt me.
0:01:50 > 0:01:53I saw you at the hotel and at Greta's house.
0:01:53 > 0:01:56I thought you had taken my friend. It's OK, Bronka,
0:01:56 > 0:01:59I'm a police officer. She didn't come home. I didn't know where she was.
0:01:59 > 0:02:01Bronka, when did you last see Kasia?
0:02:01 > 0:02:05PANTING
0:02:05 > 0:02:06Monday.
0:02:08 > 0:02:10Greta told her to come to the flat...
0:02:11 > 0:02:13..to collect her stuff.
0:02:13 > 0:02:15They were friends?
0:02:17 > 0:02:18Yes.
0:02:19 > 0:02:22Sometimes, Greta and Kasia have a drink.
0:02:23 > 0:02:26Sometimes, Kasia stays the night there.
0:02:27 > 0:02:29Greta was teaching her English.
0:02:29 > 0:02:34So, why did Greta ask Kasia to collect her stuff?
0:02:37 > 0:02:38There was an argument.
0:02:38 > 0:02:40What about?
0:02:46 > 0:02:48We need to know, Bronka.
0:02:50 > 0:02:51There was a row...
0:02:52 > 0:02:53..about Greta's father.
0:02:55 > 0:02:58Was Kasia sleeping with him?
0:03:01 > 0:03:02Yes.
0:03:02 > 0:03:04For money? No!
0:03:04 > 0:03:05It wasn't like that.
0:03:05 > 0:03:09Kasia cared about Greta's father.
0:03:09 > 0:03:11She liked him very much.
0:03:11 > 0:03:15Why did Greta's father give Kasia money?
0:03:18 > 0:03:19It was...
0:03:20 > 0:03:21..for Kasia's daughter...
0:03:23 > 0:03:24..in Poland.
0:03:29 > 0:03:32To help pay for her to come here.
0:03:34 > 0:03:36Kasia loved her daughter very much.
0:03:38 > 0:03:40She missed her.
0:03:42 > 0:03:44The money was a gift.
0:03:44 > 0:03:46Can you think of anyone
0:03:46 > 0:03:49that would want to hurt Kasia?
0:03:52 > 0:03:54A friend?
0:03:54 > 0:03:56A colleague? Someone she talked about?
0:04:00 > 0:04:02We were in a cafe with Greta...
0:04:04 > 0:04:05..there was a man.
0:04:08 > 0:04:09He was shouting.
0:04:09 > 0:04:10When?
0:04:12 > 0:04:14Last week...
0:04:14 > 0:04:15on the front.
0:04:15 > 0:04:20He was angry. Greta was upset. Him? Was it him?
0:04:20 > 0:04:23No. Are you sure? No, it is not him.
0:04:25 > 0:04:27No! It's him!
0:04:29 > 0:04:31'That's him.'
0:04:34 > 0:04:35This is him.
0:04:49 > 0:04:52I knew as soon as I'd done it, I'd regret it.
0:04:55 > 0:04:56But I had to tell her.
0:04:58 > 0:05:01Greta wasn't pulling her weight in school, while Rhian was doing
0:05:01 > 0:05:03everything for her.
0:05:03 > 0:05:06And with Rhian expecting her first baby,
0:05:06 > 0:05:08I just didn't think it was fair.
0:05:09 > 0:05:12Rhian taking the strain while Greta was out every night
0:05:12 > 0:05:14drowning her sorrows.
0:05:14 > 0:05:15And what did you tell her?
0:05:17 > 0:05:19That she had to stop drinking.
0:05:20 > 0:05:21To think of other people.
0:05:23 > 0:05:27To pull herself together, stop feeling sorry for herself.
0:05:27 > 0:05:29To listen to those with her best interests at heart.
0:05:29 > 0:05:30Like you?
0:05:33 > 0:05:34In a way, yes.
0:05:35 > 0:05:37Why didn't you tell me?
0:05:38 > 0:05:40I didn't want to worry you, ba.
0:05:42 > 0:05:43You've got enough on your plate.
0:05:44 > 0:05:45I thought...
0:05:48 > 0:05:51I thought I could get through to her.
0:05:51 > 0:05:52And did you?
0:05:54 > 0:05:55She wouldn't listen.
0:05:56 > 0:05:59Made a bit of a scene. I just left.
0:05:59 > 0:06:01It was embarrassing.
0:06:01 > 0:06:04Greta was involved with someone online.
0:06:06 > 0:06:09Does the name Ben Willis mean anything to you?
0:06:14 > 0:06:15No.
0:06:15 > 0:06:17Sorry.
0:06:38 > 0:06:39CLUNK
0:06:39 > 0:06:42ELECTRICAL WHIRRING
0:07:02 > 0:07:03WHIRRING STOPS
0:07:06 > 0:07:08I hear you spoke to Iwan Thomas.
0:07:12 > 0:07:14That's right.
0:07:15 > 0:07:19Did he have anything interesting to say for himself?
0:07:19 > 0:07:21The man is in pain.
0:07:26 > 0:07:28He's lost everything.
0:07:29 > 0:07:31His life is in ruins.
0:07:33 > 0:07:35Some people can handle the pressure.
0:07:38 > 0:07:39Others fall by the wayside.
0:07:40 > 0:07:41Well...
0:07:46 > 0:07:49..we all have to carry our pack.
0:07:49 > 0:07:51Iwan Thomas is a dangerous man.
0:07:51 > 0:07:54He's a drunk. He's not to be trusted.
0:07:54 > 0:07:55You should stay away from him.
0:07:59 > 0:08:01He is grieving, sir.
0:08:01 > 0:08:03He needs to let go of the past.
0:08:07 > 0:08:09Don't let him drag you down, Tom.
0:08:09 > 0:08:11You have pulled yourself together,
0:08:11 > 0:08:13put the past behind you.
0:08:13 > 0:08:16That is the difference between you and him.
0:08:19 > 0:08:20Don't forget that.
0:08:29 > 0:08:30What was he doing there?
0:08:33 > 0:08:35Why was he at the site?
0:08:37 > 0:08:38I don't know.
0:08:41 > 0:08:44DOOR OPENING
0:08:55 > 0:08:56Greta Pritchard.
0:08:56 > 0:09:00Her mother's death sent her off the rails.
0:09:00 > 0:09:02She couldn't handle the grief.
0:09:02 > 0:09:04She was lonely, she found solace online.
0:09:04 > 0:09:05Ben Willis.
0:09:07 > 0:09:09But it was too much, too soon,
0:09:09 > 0:09:12so she broke it off. And that's when she met Harry Jenkins.
0:09:12 > 0:09:14When the anonymous letters started,
0:09:14 > 0:09:17the silent phone calls, the hang-ups, Greta thought it was Harry
0:09:17 > 0:09:21that was responsible, but it wasn't. It was this guy - Ben Willis.
0:09:21 > 0:09:23Somebody has got to know who he is.
0:09:25 > 0:09:26You're right, Mared. But who?
0:09:57 > 0:09:59'Ben Willis.'
0:09:59 > 0:10:01Greta had a relationship with him online,
0:10:01 > 0:10:04for a number of months, before she cut contact.
0:10:05 > 0:10:06Ben Willis.
0:10:06 > 0:10:08Wait a minute.
0:10:14 > 0:10:15Now, then...
0:10:24 > 0:10:26There he is.
0:10:29 > 0:10:30Benjamin Willis.
0:10:31 > 0:10:33He was the groundsman on the estate.
0:10:33 > 0:10:36Helped build the school after the Great War.
0:10:36 > 0:10:39He looked after the house and gardens all his life.
0:10:48 > 0:10:49Can I keep this?
0:10:49 > 0:10:51Of course. Thanks.
0:10:56 > 0:10:58Benjamin Willis devoted his life to the estate.
0:10:58 > 0:11:02He was obsessed by it. Arwyn Parry knows every inch of the estate.
0:11:02 > 0:11:05'He also knows the history. I think he has used the name'
0:11:05 > 0:11:07Ben Willis as an alias.
0:11:07 > 0:11:08I think he is our killer.
0:11:08 > 0:11:10'Get all units over to the school.'
0:11:10 > 0:11:13Greta could still be alive.
0:11:13 > 0:11:15We also need to warn Rhian. She could be in danger.
0:11:45 > 0:11:48PANTING
0:12:59 > 0:13:01DOOR OPENS
0:13:01 > 0:13:02Rhian?
0:13:13 > 0:13:14PHONE RINGS
0:13:14 > 0:13:15Come on!
0:13:18 > 0:13:21PHONE VIBRATES
0:13:59 > 0:14:00KNOCKING
0:14:02 > 0:14:03TRIES DOOR
0:14:50 > 0:14:52MUFFLED THUDDING
0:14:56 > 0:14:57Rhian?
0:15:24 > 0:15:25Are you OK?
0:15:35 > 0:15:36Where is he, Rhian?
0:15:40 > 0:15:43POLICE SIREN WAILS
0:15:52 > 0:15:53Rhian!
0:15:55 > 0:15:56Tom!
0:16:08 > 0:16:09Arwyn?
0:16:11 > 0:16:12DOOR OPENING
0:16:25 > 0:16:26Arwyn?
0:16:27 > 0:16:29Arwyn, I know you're here.
0:16:35 > 0:16:37FOOTSTEPS
0:16:39 > 0:16:41FOOTSTEPS
0:17:03 > 0:17:04DISTANT THUD
0:17:08 > 0:17:10DOOR OPENING
0:17:10 > 0:17:12RUNNING FOOTSTEPS
0:19:03 > 0:19:04Arwyn!
0:19:13 > 0:19:14Arwyn.
0:19:17 > 0:19:18It's over.
0:19:18 > 0:19:20I know it was you that killed Kasia.
0:19:23 > 0:19:24Where's Greta?!
0:19:26 > 0:19:28Arwyn!!
0:19:28 > 0:19:30DISTANT WOMAN'S SHOUT: Here!
0:19:30 > 0:19:31Greta.
0:19:31 > 0:19:32DISTANT: Here!
0:19:32 > 0:19:34Where are you?
0:19:34 > 0:19:35DISTANT: In here!
0:19:40 > 0:19:41I'm over here!
0:19:44 > 0:19:45Hello?
0:19:45 > 0:19:46Hello?!
0:19:49 > 0:19:50Greta?!
0:19:50 > 0:19:51I'm in the well!
0:19:51 > 0:19:52Over here!
0:19:56 > 0:19:57Greta! Please help me! Please!
0:20:00 > 0:20:02Please help me! Please!
0:20:03 > 0:20:05Greta, it's going to be all right.
0:20:05 > 0:20:08Please! It's going to be fine. I'm here to help you, OK?
0:20:08 > 0:20:09SHE SCREAMS
0:21:01 > 0:21:02Sir!
0:21:03 > 0:21:04Sir.
0:21:04 > 0:21:05COUGHING
0:21:10 > 0:21:11Sir.
0:21:11 > 0:21:12Sir!
0:22:02 > 0:22:03I wanted to help her.
0:22:07 > 0:22:08She seemed so alone.
0:22:11 > 0:22:12Lost.
0:22:22 > 0:22:24A few weeks after her mother died...
0:22:26 > 0:22:27..I found her in the classroom.
0:22:29 > 0:22:31It was late.
0:22:31 > 0:22:32Everyone else had gone.
0:22:35 > 0:22:36She was crying.
0:22:39 > 0:22:42I offered her a lift home. She wasn't fit to drive.
0:22:45 > 0:22:46We got to her house.
0:22:48 > 0:22:49It was raining.
0:22:52 > 0:22:53She didn't say a word.
0:22:55 > 0:22:57Just sat there in the car with me...
0:22:59 > 0:23:02..as if she didn't want to leave.
0:23:05 > 0:23:07When she got out of the car...
0:23:11 > 0:23:13I-I could still smell her.
0:23:16 > 0:23:17And Ben Willis?
0:23:19 > 0:23:21He gave his life to that estate.
0:23:22 > 0:23:24It meant everything to him.
0:23:28 > 0:23:29Being Ben...
0:23:31 > 0:23:33..I could be anyone.
0:23:33 > 0:23:35Go anywhere.
0:23:36 > 0:23:39But then, Greta just cut me off. I couldn't let that happen.
0:23:39 > 0:23:41And Gareth Rhys-Jones?
0:23:42 > 0:23:44You set him up.
0:23:44 > 0:23:46And then you destroyed him.
0:23:46 > 0:23:47He was getting too close to her.
0:23:47 > 0:23:49You didn't want her to have any friends?
0:23:53 > 0:23:55She didn't need any friends.
0:23:57 > 0:23:59All she needed was me.
0:23:59 > 0:24:00Why kill Kasia?
0:24:02 > 0:24:04She was in the wrong place at the wrong time.
0:24:04 > 0:24:07I... She turned up at Greta's house with flowers, found me,
0:24:07 > 0:24:09started screaming...
0:24:09 > 0:24:11And you strangled her.
0:24:11 > 0:24:12I had no choice!!
0:24:32 > 0:24:35What about your wife, Arwyn?
0:24:37 > 0:24:39What about your baby?
0:24:47 > 0:24:48I-I...love Rhian.
0:24:53 > 0:24:55But...
0:24:55 > 0:24:56I thought...
0:24:57 > 0:24:59I thought I could have it all.
0:25:02 > 0:25:05WEEPING
0:25:41 > 0:25:42FOOTSTEPS
0:26:18 > 0:26:19Are you OK, sir?
0:26:21 > 0:26:22Yeah, I will be.
0:26:23 > 0:26:25And you? Yes, sir.
0:26:39 > 0:26:40Thank you, Lloyd.