Overview: A man hires Diamond to investigate an outer space society which he suspects is out to bilk his rich uncle since they have talked him into leaving the society $100,000 in his will.
Overview: Diamond is hired to protect a lady politician whose supporters fear she may be kidnapped by the opposition.
Overview: Diamond is hired to track down a gang of safe crackers and recover the money that they stole.
Overview: A man convicted of a jewel theft years earlier still claims to be innocent even though the jewels start to show up on the black market as soon as he is released from prison.
Overview: Diamond is hired to investigate a fire in a fur shop which killed an accountant who was working there.
Overview: A veteran journalist and a recovering alcoholic join forces in order to get a story on a protection racket.
Overview: Diamond uncovers a protection racket when he decides to learn why a pair of his Chinese friends unexpectedly call off their upcoming wedding.
Overview: A cowboy performing in a Madison Square garden rodeo comes to Diamond for help after he discovers his saddle strap cut and suspects that someone is trying to kill him.
Overview: While taking a break from an all night drive at a roadside cafe, Diamond meets a woman who gives him a look convincing him she is afraid of something.
Overview: Diamond is beaten and rendered unconscious by a man he suspects is an art thief. When he recovers he discovers that a beautiful woman has subdued his attacker.
Overview: Diamond is hired by a woman to clear her son of charges of murder, since he is a member of a gang which robbed a liquor store and killed the sales clerk.
Overview: A jewelry store owner comes to Diamond for help when one of his employees refuses to return gems he had been assigned to clean unless he is given a large cash stipend.
Overview: Diamond goes under cover as a truck driver in order to investigate a truck hijacking in which the driver was killed.
Overview: Diamond sets out to find the man who is trying to kill him and who failed in his last attempt, leaving an innocent bystander dead.
Overview: Diamond fails in his efforts to protect a shady night club owner who believes that someone is out to kill him.
Overview: While investigating the death of an investment counselor, Diamond learns that a letter has recently been stolen from the deceased's attorney.
Overview: Diamond is hired by a singer who finds himself being threatened by extortionists.
Overview: Diamond and his client are kidnapped by gangsters who threaten to kill both of them unless Diamond reveals the location of valuable paintings from another case.
Overview: Diamond is called upon to investigate the murder of a film producer and upon arriving at the scene of the crime learns that the police have not been notified of the man's death.
Overview: After a policeman friend of Diamond's is killed while on patrol, Diamond decides to do an investigation of his own to insure that the killer is brought to justice.
Overview: Diamond uncovers a narcotics smuggling operation while investigating the murder of an art restorer who was killed in his workshop.