4x1 - The Hoodlum

October 5, 1959

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.

4x2 - Act of Grace

October 12, 1959

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.

4x3 - The Bookie

October 19, 1959

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.

4x4 - The Client

October 26, 1959

A financier hires Diamond to search for his partner who has gone missing in Mexico.

4x5 - The Runaway

November 2, 1959

While briefly stopping in San Francisco, Diamond finds himself the target of a gunman.

4x6 - No Laughing Matter

November 9, 1959

Diamond finds himself in a deserted amusement park on the trail of a desperate fugitive murderer.

4x7 - The Messenger

November 16, 1959

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

4x8 - The Counselor

November 23, 1959

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

4x10 - The Adjustor

December 7, 1959

Diamond receives a tip that a man who has been presumed dead for over a year is still alive.

4x11 - Marked for Murder

December 14, 1959

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

4x12 - The Caller

December 21, 1959

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

4x13 - One Dead Cat

December 28, 1959

A night club singer hires Diamond to protect her and her band leader from a disgruntled pianist who once played in their band.

4x14 - Dead to the World

January 11, 1960

A friend of Sam's wants Diamond to prove that her uncle's death was murder.

4x15 - Seven Swords

January 18, 1960

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?

4x16 - The Fine Art of Murder

January 25, 1960

An actress hires Diamond after she learns that a valuable painting which she purchased is a fake.

4x17 - The Popskull

June 28, 1960

Diamond follows a dog which is pursuing a bedraggled cat.

4x18 - And Whose Little Baby Are You?

July 5, 1960

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

4x19 - Fallen Star

July 19, 1960

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.

4x20 - Coat of Arms

August 2, 1960

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.

4x21 - Double Trouble

August 9, 1960

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

4x22 - The Lovely Fraud

August 16, 1960

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.

4x23 - Accent on Murder

August 23, 1960

A woman is killed after hiring Diamond to protect ""a young lady from France"" who turns out to be a poodle.

4x24 - East of Danger

August 30, 1960

A woman hires Diamond when her father is attacked after he finds heroin hidden in his antique store warehouse.

4x25 - Running Scared

September 6, 1960

A man is concerned about his daughter, whom he feels has been spending too much time brooding over her husband's death.

4x26 - The Mouse

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