Much more than having a shrapnel lodged in his head, Mark Lucas suffers from the heartache of a car accident he caused because it killed his wife and unborn child. Mark finds hope of returning to life when he learns of a psychiatric experiment that could rid him of unbearable, painful memories. But after his first visit to the clinic, something frighteningly strange happens to him. The contact list on the phone is empty. The key to Mark's apartment no longer fits the lock. The name on the sign is someone else's. And when the door opens from the inside in response to his call, Mark finds himself in his worst nightmare...