David, his drug-using sister Mia and his friends Eric, Olivia and Natalie travel to an isolated cabin that belonged to his parents to spend a couple of days together. Mia promises to stop using drugs and Olivia, who is a nurse, promises to help Mia in her abstinence. They discover a hidden basement with witchcraft and the Book of the Dead, and Eric reads it and unintentionally summons an evil force. Mia, Olivia and Natalie are possessed by evil and Eric reads the book trying to learn how to destroy the demon.
