After witnessing the murder of a police officer, when Madison Tayor (Nicky Whelan) is shot in the leg, it becomes clear her life is in danger. The deceased officer's partner, veteran cop Lieutenant Wakes (Bruce Willis), takes on the task of keeping Madison safe in an eerily isolated trauma center on the empty floor of a hospital. The only person on the floor, besides Madison, is an armed police officer, just outside the door of her hospital room.
Wakes leaves her there to go investigate the murder scene and discovers that the killers are a pair of crooked cops. Not only that, but they've gone after Madison to retrieve the only piece of evidence that can implicate them in the grisly murder — the bullet in her leg.