Long ago, a room in a small-town inn was the site of a gruesome double murder. Decades later, with the town terrorized once again by bloody ritual killings, a mysterious woman suffers bizarre flashbacks related to the slayings.

During an exclusive tour, a power breakdown inside a secret prison known as the Death House sends two agents fighting through a labyrinth of horrors while being pursued by a ruthless army of roaming inmates. As they fight to escape, the agents push toward the lowest depths of the facility where they learn a supernatural group of evil beings is their only chance for survival.