It is everyone for themselves in a world where children can do anything they want and every single person over the age of 15 has disappeared.
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When a group of children return from a school trip, every person over 15 has disappeared.
Kat is on a mission to find out what has caused the disappearance of all the adults.
Having won her place in Sadiq's gang, Kat leads a team to the university to find food.
The children choose who goes on the road to the Sparticle Project and who stays behind.
The Questers stop at a funfair where Reese has a vision of Doomsday Dora.
The Questers find a simulator where scientists learned how to run the Sparticle Project.
Tia and Jeffrey discover a satellite communication system.
The Ranchers work out how to bypass the first door at the Sparticle Project.
Kat figures out the wormhole events are occurring at points where ley lines intersect.
Holly is anxious as the journey to the Sparticle Project nears its conclusion.
Without the adults, the world's nuclear power plants are melting down.
Ami lapses into a diabetic coma and the Questers rush him to hospital to find insulin.
The Questers and Ranchers are reunited at Black Tor Mine.