Relatives and colleagues of reclusive writer Samantha Ballard track her to an isolated house in the California desert where they discover a traumatized Samantha. She greets them with the grim announcement that they will die if they attempt to leave the house. After Samantha’s ex-husband and his girlfriend suffer horrible deaths while trying to escape, the others realize that she was serious. They begin to scheme a safe way out even as the malevolent force that rules the house stirs the worst fears of each of them, causing them to wonder: Can they escape the evil house before their fears kill them all?