Imagine England in the near future. Juvenile lawbreakers who have committed a serious crime can be sentenced to life in a maximum security prison that is run by a private corporation. Alex, a 14-year-old juvenile delinquent, is framed for his best friend’s murder while they were committing a robbery. Once inside Furnace (the prison), he ends up fighting for his life while, at the same time, trying to figure out an escape … because something reeeally nasty is happening to some of the inmates. They’ve been hauled out of their cells in the middle of the night by hideous monstrosities that vaguely resemble other inmates who disappeared from their cells or were taken away for rule infractions.