When his daughter, Angela, and her friend Katherine, show signs of demonic possession, it unleashes a chain of events that forces single father Victor Fielding to confront the nadir of evil. Terrified and desperate, he seeks out Chris MacNeil, the only person alive who's witnessed anything like it before.
Audrey is a senior in High School and has her whole life ahead of her when she realizes she can't remember the last time she got her period. She breaks the news to her boyfriend just hours after the death of his grandmother. Once his obviously unstable mother enters back into the picture things spiral out of control for everyone involved.
On the cusp of New Year's Eve, seven friends and a mysterious backpacker converge at a desolate ski lodge in the mountains when they are systematically hunted down by ruthless masked men with a cryptic agenda.