The Gone Series : Lies by Michael Grant

It's Lord of the Flies for the Heroes generation. It happens in one night: a girl who died now walks among the living, Zil and the Human Crew set fire to Perdido Beach, and amid the flames and smoke, Sam sees the figure of the boy he fears the most - Drake. As Perdido Beach burns, battles rage: Astrid against the Town Council; the Human Crew versus the mutants; and Sam against Drake. As life in the FAYZ becomes more desperate, no one knows who they can trust. A tour-de-force from global sensation, Michael Grant, Lies is the third book in this bestselling series. "I love these books" - Stephen King