Diamond promises a dying gangster that he will take care of the gangster's girlfriend, unaware that the promise will endanger his life.
A woman in the hospital hires Diamond to trail her ex-husband, who she believes has obtained custody of their daughter to use as cover for his shady business practices.
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.
Diamond sets out to con a recently widowed woman and her lover into believing that he witnessed them kill her late husband so that they could collect the insurance money.
While on holiday in the mountains Diamond befriends a young woman who is being pursued by thugs who believe that she has taken some incriminating photos.
Diamond finds himself facing off against the mob when is hired by a woman to prove that her fiancee is innocent of killing a man in a hit and run auto accident.
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.
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 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 plays a game of cat and mouse with an escaped convict who bears a grudge against Diamond for bringing him to justice.
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.
Diamond attempts to convince an old war buddy who has turned to a life of crime to give himself up to the authorities.
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 to protect a lady politician whose supporters fear she may be kidnapped by the opposition.
Diamond is hired to track down a gang of safe crackers and recover the money that they stole.
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.
Diamond is hired to investigate a fire in a fur shop which killed an accountant who was working there.
A veteran journalist and a recovering alcoholic join forces in order to get a story on a protection racket.
Diamond uncovers a protection racket when he decides to learn why a pair of his Chinese friends unexpectedly call off their upcoming wedding.
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.
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 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.
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.
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.
Diamond goes under cover as a truck driver in order to investigate a truck hijacking in which the driver was killed.
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.
Diamond fails in his efforts to protect a shady night club owner who believes that someone is out to kill him.
While investigating the death of an investment counselor, Diamond learns that a letter has recently been stolen from the deceased's attorney.
Diamond is hired by a singer who finds himself being threatened by extortionists.
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.
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.
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.
Diamond uncovers a narcotics smuggling operation while investigating the murder of an art restorer who was killed in his workshop.
Diamond moves to Los Angles where he begins to date Karen after she hires him to find her boyfriend's murderer. A woman hires him to find her playboy son who has gone missing.
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.
A mobster wanted by the law fears that he is going to be assassinated and asks Diamond to negotiate his surrender to the police.
A couple from South America hire Diamond to find a political refugee from their country who is hiding in the U.S.
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.
Diamond heads to Mexico in search of a missing art dealer.
Diamond winds up in the middle of a deadly conspiracy when he agrees to help a wealthy young man find his missing bride.
An antique dealer hires Diamond to find an Oriental cigarette box and his employee who disappeared while delivering the box.
A masked gunman steals the box office receipts of a charity jazz festival which Diamond is attending.
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.
An art dealer asks Diamond to make a clandestine investigation into the disappearance of a valuable crown which vanished from a safe on board a yacht.
A jukebox operator asks Diamond for help when he is threatened by racketeers who want him to use their records exclusively.
Diamond learns that a friend of his, a TV personality, is undergoing marital problems and that his wife may be out to kill him.
A terrified woman calls Diamond for help after her life is threatened, but by the time Diamond arrives to meet with her she has disappeared.
A nun asks Diamond to locate a missing young boy who is a member of a Dixieland band she has organized.
Diamond goes undercover as a casino worker in order to find a priceless jewel that has been stolen.
Diamond discovers some unpleasant facts about a young woman who was murdered after he talks to her roommate, a dance hall hostess.
An old flame of Diamond's comes to him hoping to hire him to find out who is attempting to blackmail her.
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.
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 decides to get rid of Lt. Kile, whose efforts to put a stop to the bookie's operation have begun to annoy him.
A financier hires Diamond to search for his partner who has gone missing in Mexico.
While briefly stopping in San Francisco, Diamond finds himself the target of a gunman.
Diamond finds himself in a deserted amusement park on the trail of a desperate fugitive murderer.
Diamond is hired to deliver a note to a bank teller and is somewhat surprised when the teller screams after she reads the note.
A marriage counselor whose life has been threatened hires Diamond to protect him.
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 receives a tip that a man who has been presumed dead for over a year is still alive.
Diamond finds himself in a lonely hearts club when he is hired to investigate the confusing circumstances surrounding a robbery and murder.
Diamond receives a mysterious telephone call which informs him that he will die at a specific time later that evening.
A night club singer hires Diamond to protect her and her band leader from a disgruntled pianist who once played in their band.
A friend of Sam's wants Diamond to prove that her uncle's death was murder.
Summoned to a theater by a phone call, Diamond watches a magician thrust seven swords into a box containing his assistant. Is this the dangerous situation he was called to deal with?
An actress hires Diamond after she learns that a valuable painting which she purchased is a fake.
A reputable bar owner is being forced to sell rotgut whiskey until the owner's wife hires Diamond to intervene.
After returning to his apartment with a date, Diamond finds an infant abandoned on his couch.
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.
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.
A diplomat who does not want the police to be involved, asks Diamond to find his missing fiancee.
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.
A woman is killed after hiring Diamond to protect 'a young lady from France' who turns out to be a poodle.
A woman hires Diamond when her father is attacked after he finds heroin hidden in his antique store warehouse.
A man is concerned about his daughter, whom he feels has been spending too much time brooding over her husband's death.
A French woman gets threats from a supposedly dead war criminal who knows the whereabouts of a fortune in smuggled diamonds.