Mia, a drug addict, is determined to kick the habit. To that end, she asks her brother, David, his girlfriend, Natalie and their friends Olivia and Eric to accompany her to their family's remote forest cabin to help her through withdrawal. Eric finds a mysterious Book of the Dead at the cabin and reads aloud from it, awakening an ancient demon. All hell breaks loose when the malevolent entity possesses Mia.
A WWII pilot traveling with top secret documents on a B-17 Flying Fortress encounters an evil presence on board the flight.
When the experienced guide Vic accompanies the city boy Alan and his three friends on their first wilderness experience, he not only hopes to teach the four boys lessons about the wilderness, but about themselves. Vic pushes them to the limit. Soon after alienating the boys, Vic finds himself in desperate need of help and must rely on his students in order to survive.
