A group of strangers awake, trapped inside an abandoned mental hospital. With no apparent way out, and no one sure how they got there, they begin searching for a way to escape. As they explore the cold, dark maze of corridors they realize they are not alone and that they are being stalked by supernatural forces with sinister intentions. As they begin to unravel they realize that it might not be them that are trapped inside, but something truly evil that is locked outside! In this place nothing is what it seems and the decisions they make will seal their fate forever.