With the rest of the campus home for the Thanksgiving holiday, Justine and a few of her friends spend the weekend in their college dormitory: studying, relaxing and blissfully unaware of the terror that is about to unfold outside in the cold. Suddenly, confronted by a gang of violent outcasts, Justine's quiet long weekend becomes one long lesson in survival as her and her classmates are terrorized in increasingly bizarre and brutal ways, leaving it up to her to figure out who her attackers are...and if they can be stopped.