Delving further into the bowels of Furnace Penitentiary, Alex Sawyer desperately tries to hold onto his fleeting sanity. After a failed attempt to escape the underground horrors, being thrown into solitary confinement is a fate worse than death. A hole in the rocky earth becomes his coffin, yet it won't save him from what roams the corridors, in search of warm flesh to eat.
Taking part in a school trip, five teenagers and their teacher set out on a long walk across Rutmoor, thinking it to be a fun experience with friends. What they don’t expect is odd noises in the dead of night, and dead animals placed outside their tents. When tensions and tempers arise, the group soon begins to fall apart, until a dramatic turn leads them to fear for their very lives.