A group of kids in a small town in the United States USA save a zoo.

Unbeknownst to the trio, their corporate obligation will soon become a fight for survival. When The Doctor targets them, the celebration descends into a blood-soaked nightmare. Trapped in Hooper Industries' towering building, Leslie, Brian, Moses, and their unsuspecting colleagues must confront a deranged killer intent on making this night unforgettable-for all the wrong reasons.