S2E1 - The Space Society
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.
Jan. 2, 1958, midnight
S2E2 - The Dark Horse (a.k.a. The Allison Garvey Case)
Diamond is hired to protect a lady politician whose supporters fear she may be kidnapped by the opposition.
Jan. 9, 1958, midnight
S2E3 - The Payoff
Diamond is hired to track down a gang of safe crackers and recover the money that they stole.
Jan. 16, 1958, midnight
S2E4 - Double Jeopardy
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.
Jan. 23, 1958, midnight
S2E5 - Arson
Diamond is hired to investigate a fire in a fur shop which killed an accountant who was working there.
Jan. 30, 1958, midnight
S2E6 - The Ed Church Case
A veteran journalist and a recovering alcoholic join forces in order to get a story on a protection racket.
Feb. 6, 1958, midnight
S2E7 - Chinese Honeymoon (a.k.a. Trouble in Chinatown)
Diamond uncovers a protection racket when he decides to learn why a pair of his Chinese friends unexpectedly call off their upcoming wedding.
Feb. 13, 1958, midnight
S2E8 - Rodeo
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.
Feb. 20, 1958, midnight
S2E9 - A Cup of Black Coffee
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.
Feb. 27, 1958, midnight
S2E10 - The George Dale Case
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.
March 6, 1958, midnight
S2E11 - Juvenile Jacket
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.
March 13, 1958, midnight
S2E12 - Pension Plan
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.
March 27, 1958, midnight
S2E13 - Short Haul
Diamond goes under cover as a truck driver in order to investigate a truck hijacking in which the driver was killed.
April 10, 1958, midnight
S2E14 - Another Man's Poison
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.
April 17, 1958, midnight
S2E15 - The Purple Penguin
Diamond fails in his efforts to protect a shady night club owner who believes that someone is out to kill him.
April 24, 1958, midnight
S2E16 - Lost Testament
While investigating the death of an investment counselor, Diamond learns that a letter has recently been stolen from the deceased's attorney.
May 1, 1958, midnight
S2E17 - The Percentage Takers
Diamond is hired by a singer who finds himself being threatened by extortionists.
May 8, 1958, midnight
S2E18 - Widow's Walk
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.
May 22, 1958, midnight
S2E19 - The Bungalow Murder
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.
May 29, 1958, midnight
S2E20 - One Foot in the Grave
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.
June 12, 1958, midnight
S2E21 - Snow Queen
Diamond uncovers a narcotics smuggling operation while investigating the murder of an art restorer who was killed in his workshop.
June 26, 1958, midnight