In a hotel room, there is a man lying on the bed. He wakes up to the piercing sound of the phone ringing. Picking up the phone, he hears a message from the hotel concierge, “If you have any trouble, please visit the front desk.” The man doesn’t even know why he is in the hotel. In fact, he doesn’t remember anything at all.

As he begins to look around, he suddenly finds a woman tied up and unconscious. The evening news on the TV shows the figure of a man who is wanted as a serial killer.

Then comes the sound of knocking on the door.