In the Christmas Eve in New York, the workaholic executive Angela works until late night. When she is ready to drive to her family's Christmas party, her BMW does not start and she calls a cab. However, she is unable to leave the building, since all the exits are locked, and she returns to the garage, where she meets the night watch Thomas. The security guard tries to help her with a battery charger, but the car does not start. Angela asks him to open the gate; however, she is unexpectedly attacked by a psychopath, beginning her night of horror trapped in the building.