When demonic creatures invade Earth, a group of five high schoolers-Val, Alexis, Charlie, Casey, and Piper-find themselves trapped in their Catholic school, protected only by the crosses lining its walls. The group struggles to survive in a world turned upside down, each bringing their strengths and flaws to the table. Val, the edgy yet kind-hearted leader, wrestles with her feelings for Casey, a quiet and unusually tall classmate who harbors a dark secret.
In a world where survival is uncertain, the group must navigate their relationships, confront their fears, and ultimately decide who to trust as they stand against the demonic forces threatening humanity.