In the life of a girl named Riley, things don't turn out as well as she'd like. Now she has alcohol and drug problems. Her brother Matt is trying to help her sister in any way he can, but her new boyfriend Trevor is too much of a negative influence on Riley. Someday, he invites her to rob an abandoned warehouse, where she finds a mystical puzzle box. Only some time after the rotation of this ancient artifact, she realizes that she has summoned underworld demons with sadistic inclinations, they are called the Cenobites.