Middleweight boxing champ Shane embarks on an affair with a sultry lounge singer. When she is found dead, Shane becomes the prime suspect in her murder.

After a series of murders in motel rooms are connected, police detective Matt Dickson heads out on the trail to find a serial killer. He discovers that he signs the motel guest-books with the names of boxers, and gets a lead on him. However, just when he fails to catch up arrest him, the chase becomes personal.