Young businesswoman Angela Bridges (Rachel Nichols) works in a downtown Manhattan office block and gets stuck working late on Christmas Eve, before leaving to attend a family party. On her way to her car in the second underground parking lot level (P2) beneath the office block, she discovers that her car will not start. After receiving some assistance from the security guard named Thomas (Wes Bentley) and turning down his offer to spend Christmas with him, she calls for a taxi and waits in the lobby.
When the taxi arrives, she discovers she is locked in the lobby and runs back into the parking garage. The taxi left her and the lights soon shut down. Angela, guided by the light on her cell phone, wanders around the deserted parking lot. Thomas attacks Angela, drugs her with chloroform, and takes her to his office.