Los Angeles, Christmas day. Airport security officer Ethan Kopeck is already looking forward to working this challenging shift and, in the evening, celebrating Christmas together with his pregnant girlfriend, who also works here. Determined to get a promotion, he asks his boss to give him a more difficult task and put him on the X‑ray machine. Soon, an unknown person contacts Ethan and urgently asks him to run the luggage with prohibited contents through the X‑ray machine; otherwise, his girlfriend will die.