When an actor throws an impromptu soirée at his Hollywood home, with only his closest friends in attendance, a fun evening devolves into something much darker after he makes an unexpected announcement to the group.
In a massive, mysterious chamber, fifty strangers awaken to find themselves trapped with no memory of how they got there. Organized in an inward-facing circle and unable to move, they quickly learn that every two minutes, one of them must die…executed by a strange device in the center of the room.