Two children wake up in the middle of the night to find their father is missing, and all the windows and doors in their home have vanished.

　　It tells the story of a therapy group that is forced to confront the monsters of their past when an isolated weekend retreat tests their emotional resilience and ability to survive.

　　At a cabin deep in the wilderness, a weekend of hunting turns to mayhem and a fight for survival when a pack of wolves attack a man, his female best friend and her fiance.