 In the middle of nowhere, there lies a secure facility housing only serial killers. One morning the doors are open and the guards have vanished, but a strange freezing mist surrounds the building, preventing the inmates from leaving. Then, one by one, they are murdered. The survivors bicker, fight and blame each other, but the thing that s killing them looks suspiciously like a traditional  victim ... A babysitter in a shower, a cheerleader, a camper...