A journalist hires Diamond to look into the death of a singer who fell to her death, which he suspects was a murder but that the police have ruled a suicide.

An old nemesis of Diamond's on the police force has Diamond arrested on murder charges after the girlfriend of an escaped convict is found murdered.

Diamond discovers some unpleasant facts about a young woman who was murdered after he talks to her roommate, a dance hall hostess.

Diamond winds up in the middle of a deadly conspiracy when he agrees to help a wealthy young man find his missing bride.

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.

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.

Diamond plays a game of cat and mouse with an escaped convict who bears a grudge against Diamond for bringing him to justice.

After returning to his apartment with a date, Diamond finds an infant abandoned on his couch.

A marriage counselor whose life has been threatened hires Diamond to protect him.

Diamond goes undercover as a casino worker in order to find a priceless jewel that has been stolen.

Diamond heads to Mexico in search of a missing art dealer.

Diamond uncovers a protection racket when he decides to learn why a pair of his Chinese friends unexpectedly call off their upcoming wedding.

Diamond unravels a story of unrequited love and revenge while tracking down a fugitive gangster who is in the possession of a valuable stolen necklace.

Diamond follows a dog which is pursuing a bedraggled cat.

Diamond is hired to deliver a note to a bank teller and is somewhat surprised when the teller screams after she reads the note.

An attractive young woman pleads with Diamond to investigate the murder of a fiananceer. Diamond later learns that her father is the police detective assigned to solve the case.

While investigating the death of an investment counselor, Diamond learns that a letter has recently been stolen from the deceased's attorney.

A veteran journalist and a recovering alcoholic join forces in order to get a story on a protection racket.

Diamond is hired by a woman to become a bodyguard to her husband, without him knowing it. He is a businessman who has received several threats against his life which he refuses to take seriously.

Diamond poses as a rich Canadian and infiltrates a gambling racket in order to learn the truth about a businessman's claims that he witnessed a murder.

A French woman gets threats from a supposedly dead war criminal who knows the whereabouts of a fortune in smuggled diamonds.

Diamond promises a dying gangster that he will take care of the gangster's girlfriend, unaware that the promise will endanger his life.

Diamond is hired to verify the authenticity of an ancient Greek statue, which is suspected of being fake when it is offered for sale at a figure far below its true value.

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.

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.

An antique dealer hires Diamond to find an Oriental cigarette box and his employee who disappeared while delivering the box.

An old flame of Diamond's comes to him hoping to hire him to find out who is attempting to blackmail her.

A landlady finds one of her tenants dead in his room and shortly afterwards is greeted by a gun-wielding stranger looking for the man.

Diamond attempts to convince an old war buddy who has turned to a life of crime to give himself up to the authorities.

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.

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.

A masked gunman steals the box office receipts of a charity jazz festival which Diamond is attending.

A racketeer's bookkeeper gets Diamond involved in a blackmail scheme against his boss, when he asks him to find a book and gives him only one hour to do so.

Diamond finds himself in a lonely hearts club when he is hired to investigate the confusing circumstances surrounding a robbery and murder.

A diplomat who does not want the police to be involved, asks Diamond to find his missing fiancee.

A man hires Diamond to watch over his frightened wife while he is out of town, but then Diamond is approached by a pair of doctors from a mental institution who claim she is an escaped patient.

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.

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.

Diamond uncovers a narcotics smuggling operation while investigating the murder of an art restorer who was killed in his workshop.

After inheriting half of a citrus packing plant, a pair of brothers hire Diamond to investigate a young woman they suspect is a golddigger, who has been romancing their late father's partner.

Diamond receives a mysterious telephone call which informs him that he will die at a specific time later that evening.

Shortly after a dancer takes out a large insurance policy on her legs, she gets injured by a hit and run driver and is forced to collect on the policy.