A former detective, Austen, suddenly shoots a man and forces Hammer to kill him. There doesn't seem to be an explanation so Hammer is determined to find out why. The only clue is a mysterious blonde woman with a marked dime. However, nobody knows who the blonde is. Hammer next visits the psychiatrist who has been treating him. After meeting Austen's employer Hammer is still not sure what is going on. When Hammer breaks in and steals his psychiatric report things start to make sense. And when more bodies start appearing, the common link is the psychiatric clinic.