S4E1 - The Hoodlum
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.
Oct. 5, 1959, midnight
S4E2 - Act of Grace
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.
Oct. 12, 1959, midnight
S4E3 - The Bookie
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.
Oct. 19, 1959, midnight
S4E4 - The Client
A financier hires Diamond to search for his partner who has gone missing in Mexico.
Oct. 26, 1959, midnight
S4E5 - The Runaway
While briefly stopping in San Francisco, Diamond finds himself the target of a gunman.
Nov. 2, 1959, midnight
S4E6 - No Laughing Matter
Diamond finds himself in a deserted amusement park on the trail of a desperate fugitive murderer.
Nov. 9, 1959, midnight
S4E7 - The Messenger
Diamond is hired to deliver a note to a bank teller and is somewhat surprised when the teller screams after she reads the note.
Nov. 16, 1959, midnight
S4E8 - The Counselor
A marriage counselor whose life has been threatened hires Diamond to protect him.
Nov. 23, 1959, midnight
S4E9 - The Image
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.
Nov. 30, 1959, midnight
S4E10 - The Adjustor
Diamond receives a tip that a man who has been presumed dead for over a year is still alive.
Dec. 7, 1959, midnight
S4E11 - Marked for Murder
Diamond finds himself in a lonely hearts club when he is hired to investigate the confusing circumstances surrounding a robbery and murder.
Dec. 14, 1959, midnight
S4E12 - The Caller
Diamond receives a mysterious telephone call which informs him that he will die at a specific time later that evening.
Dec. 21, 1959, midnight
S4E13 - One Dead Cat
A night club singer hires Diamond to protect her and her band leader from a disgruntled pianist who once played in their band.
Dec. 28, 1959, midnight
S4E14 - Dead to the World
A friend of Sam's wants Diamond to prove that her uncle's death was murder.
Jan. 11, 1960, midnight
S4E15 - Seven Swords
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?
Jan. 18, 1960, midnight
S4E16 - The Fine Art of Murder
An actress hires Diamond after she learns that a valuable painting which she purchased is a fake.
Jan. 25, 1960, midnight
S4E17 - The Popskull
Diamond follows a dog which is pursuing a bedraggled cat.
June 28, 1960, midnight
S4E18 - And Whose Little Baby Are You?
After returning to his apartment with a date, Diamond finds an infant abandoned on his couch.
July 5, 1960, midnight
S4E19 - Fallen Star
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.
July 19, 1960, midnight
S4E20 - Coat of Arms
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.
Aug. 2, 1960, midnight
S4E21 - Double Trouble
A diplomat who does not want the police to be involved, asks Diamond to find his missing fiancee.
Aug. 9, 1960, midnight
S4E22 - The Lovely Fraud
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.
Aug. 16, 1960, midnight
S4E23 - Accent on Murder
A woman is killed after hiring Diamond to protect ""a young lady from France"" who turns out to be a poodle.
Aug. 23, 1960, midnight
S4E24 - East of Danger
A woman hires Diamond when her father is attacked after he finds heroin hidden in his antique store warehouse.
Aug. 30, 1960, midnight
S4E25 - Running Scared
A man is concerned about his daughter, whom he feels has been spending too much time brooding over her husband's death.
Sept. 6, 1960, midnight
S4E26 - The Mouse
A French woman gets threats from a supposedly dead war criminal who knows the whereabouts of a fortune in smuggled diamonds.