Diamond is hired by a man to find a missing wife. The man's father is the wealthy and powerful Mr. Harding Sr., an invalid in a wheel chair who thinks the woman married his son for his money and for the opportunity to stay in this country.

A henpecked marriage columnist hires Diamond to protect him, claiming someone's trying to kill him. Diamond turns him down, feeling that the man should go to the police. He thus feels guilty when the man is murdered.

Pete Rocco escapes from prison to pay Richard Diamond back for putting him there. What he doesn't know is that his brother Dan has plans of his own. Soon, Richard Diamond finds himself at the wrong and of a .38 and gets to enjoy the sweet smell of death - in a candy store...

When his latest client steals his car, private detective Richard Diamond is plunged into a case involving stolen money, a social club for the lonely and a criminal with a conscience.

A terrified woman calls Diamond for help after her life is threatened, however by the time Diamond arrives to meet with her she has disappeared.

Diamond is hired to escort a beautiful wife while her husband is on a business trip. Frightened, the wife runs out on Diamond while they are dancing. Returning to her hotel room, she is drugged and kidnapped with Diamond in pursuit.

Richard Diamond is shot and wounded in a San Francisco hotel room and sets out to find the would-be killer.

Diamond sets out to find the man who is trying to kill him and who failed in a previous attempt leaving an innocent bystander dead.

A fading actress hires Diamond to find the person who sold her a phony painting.

Diamond tries to get to the bottom of a heroin trafficking scheme.