Race car driver Larry Forsythe misses a race and his mother hires Diamond to investigate. She thinks he's missing. When he turns up dead, Diamond and Forsythe's girlfriend join forces to find out if it was an accident or not.
An old man dies alone in his shack on the beach and $84,000 is found among his pile of junk. A hopeful heir hires Richard Diamond to find out if the man is his second cousin. Diamond uncovers evidence that the old man was murdered.
Mobster Joey Kane is a marked man. There's been an attempt on his life so he decides to blow the whistle on the mob operation and turn state's witness. He hires Richard Diamond as his go-between with the police.
Richard Diamond is hired to find a woman who is living in exile in America, a woman who's opposed to the dictator of her South American country. Diamond isn't sure who he can trust.
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.
Diamond mixes business with pleasure while on a date at Marineland of the Pacific. He's hired to find a man and the package he was carrying when he disappeared.
Two brothers inherit some orange groves when their father dies. Their partner in the company is recently engaged to a much younger woman. The brothers don't trust her and hire Diamond to investigate her.
An old girlfriend of Diamond's tries to hire him to handle an extortion plot. He refuses until he's roughed up and shot at, which makes him determined to find answers.
A mobster, Trumbo, gives Diamond until 9 p.m. to turn over "the book" or else Trumbo will have him killed. Diamond doesn't have "the book" and has no idea what it is.
An acquaintance of Diamond's is murdered. At his grave at a potter's field, Diamond sees a wealthy old woman laying flowers at some of the unmarked graves. Diamond tries to find the connection between her and his down-on-his-luck friend.
A bookie that Lt. Kile has been after stages a picture of Kile in a compromising position. He threatens to send the picture to Kile's wife. Kile needs Diamond's help.
Diamond is hired to deliver a sealed note to a loan company teller and pick up a package in return. But after he does this, he is arrested and charged with attempting to rob the company.
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.
After a meeting at a restaurant Diamond wakes up the next morning seriously hung over and unable to remember anything about the previous day. But the police inform him that he has been charged with murder.
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.
