Seasons & Episodes
Season 1
32 episodes
E01
A Princely Sum
The opener finds Markham worrying about an assassination attempt on Middle East's King Hassem on his arrival in the U.S.
E02
Woman of Arles
Markham goes after art thieves who murdered a museum guard.
E03
Paris Encounter
Private Investigator Markham goes to Paris to check on a lovely Spanish lady. Louise is the lady in question and she's very fetching. Markham is trying to locate a fortune stolen from a small country.
E04
Marble Face (aka The Seance Story)
Markham has to unmask a bogus medium who's intent on deceiving an old lady.
E05
The Human Factor
Markham's client: a Canadian industrialist accused of assault. The investigator flies to Quebec to clear the executive accused of beating up a pretty secretary.
E06
The Seamark
An ex-lawyer suspects that killers are trailing his daughter---to get back at him.
E07
Three Steps to Murder
A crank's bombing of empty buildings finally kills a man.
E08
The Glass Diamond
Markham is hired by an insurance company to probe a series of gem thefts, but before he can get a clue, his best lead is slain.
E09
Vendetta in Venice
Roy Markham is hired to reunite a young girl with her father, on adventures of international investigator "Markham." Unbeknownst, he is followed by two killers who know they will be led to their target.
E10
The Last Bullet
Markham is hired by a bank to investigate the fatal shooting of a top client.
E11
Forty-Two on a Rope
Markham is drawn into a gem smuggling scheme when a nightclub performer comes to him for help escape a beatnik killer.
E12
The Duelists
Markham invesigates the mysterious disappearance of a playboy whose wife believes she may have shot him while engaged in a strange duel with him.
E13
The Counterfeit Stamps
Counterfeit stamps are flooding the London rare-stamp market.
E14
We Are All Suspect
A woman thinks her husband ran off with another woman and asks Markham to find him.
E15
The Bay of the Dead
A Mexican boy is charged with killing an anthropologist.
E16
The Other Side of the Wall
On vacation in Guatemala, Markham is asked to find a woman's vanished husband.
E17
Deadline Date
Markham is called to Hollywood when a multi-million dollar studio is being sabotaged.
E18
Girl on the Rocks
Markham goes to Portugal to investigate the death of an American beauty but meets a friend on the trail of a narcotics ring. Sister of beauty killed in mysterious explosion gives sleuth address book full of suspects.
E19
Grave and Present Danger
Actress hires Markham to protect her from revengeful actor.
E20
Double Negative
An English girl with a large Swiss bank account is trying to keep her finances secret from her government.
E21
The Nephews
Markham's nephew asks his uncle's protection when he visits an eccentric family.
E22
The Long Haul
Kitty Brady is sure the death of her trucker father was no accident.
E23
Mutation
Roy Markham finds himself on the trail of his strangest and dealiest quarry- a ship's first mate who has become infected with a deadly South Seas virus that threatens a plague.
E24
The Father
Charged with murder: the victim's son.
E25
Incident in Bel Air
An old friend asks Markham to help clear a woman suspected of murder.
E26
Round Trip to Mozambique
Markham uses a fake jewel theft to smoke out a vital witness in East Africa.
E27
Strange Visitor
The plot concerns what happens after an investigator finds a woman chloroformed in his apartment. When Markham returns to his apartment he finds a woman chloroformed but before he can summon aid, three gun-toting kidnapers appear from another room to announce that Markham's apartment will be used for a hideout until ransom is paid.
E28
The Altar
Markham goes to Hawaii at the request of an old Princeton classmate who thinks his wife is trying to murder him, but after he meets the beautiful woman he isn't sure who the intended victim is.
E29
No Flies on Friday
Markham becomes a target for an assassin when he is hired to impersonate mysterious international financier Max Bossman—whose enemies are numerous the world over— but Markham finds some pleasure in the assignment because he travels across Europe with Bossman's wife, Friday.
E30
Candy Store Jungle
An ex-con hires Markham to find his daughter---whom he's never seen.
E31
Sing a Song of Murder
Two crooked cops pursue a small boy who saw them kill a gangster.
E32
The Ambitious Wife
Markham flies to Honolulu to investigate a woman's claim that her husband is trying to kill her.
Season 2
28 episodes
Ray Milland
as Roy Markham
Simon Scott
as John Riggs
