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S1 • E1
Upon hearing that Roy Markham's (Ray Milland's) good friend, Jim Donovan, has been shot and killed on the steps of U.S. Embassy in Cairo, Markham and his partner John Riggs (Simon Scott) fly to Washington to investigate. Markham believes Boris Vascou (Anthony Eustrel), the "Vanishing Assassin," murdered his friend over information Donovan planned to share with the U.S. government about the country where he had been working as an oil engineer: "Kaleda," a small, oil-rich kingdom on the Persian Gulf. Its ruler, Prince Hassan III, is due to arrive in Washington shortly on a diplomatic visit. After crashing the right cocktail party, Roy meets the Prince's emissary, Ramik Sarid (Arnold Moss), and deduces that an assassination is in the works. He guesses it will take place at a riverside home where a beautiful French actress named Renee Compante (Jacqueline Beer) awaits the Prince. With the help of a friendly socialite boater, Diana Rogers (Betsy Jones-Moreland), Markham, Riggs and Sarid waylay Vascou and kill him.

S1 • E2
A priceless painting by "van Goff" is stolen from a New York museum and a watchman is killed. The insurance company hires Markham to find it, and a mysterious letter lures him to a town called Santa Maria. Will he find the painting there?

S1 • E3
During a revolution in Costa Dora, a casino magnate was murdered by a crime syndicate because they thought he had half a million dollars in cash. Afterwards, his daughter attracts the attention of the U.S. Bureau of Internal Revenue by spending money lavishly in Paris. Markham is approached by the Bureau to investigate and find the money.

S1 • E4
A young woman contacts Markham after moving in with an elderly aunt she hadn't seen since childhood. The niece fears that the old lady is being robbed by an unscrupulous medium whose séances bring back the spirit of the woman's long-dead son. Markham attends one of the sittings and immediately pegs the spiritualist as a phony; he also finds the aunt to be a little too theatrical to be a sheltered old hermit.

S1 • E5
A modest clerk working for an international mining company is stalked and beaten on the streets of Montreal. She accuses one of the executives in her office of doing it. Did he?

S1 • E6
A consigliere has retired from the mob -- which you can't do -- and has been in hiding for years. Consequently, he has missed out on his daughter growing up. Now, he wants to see her one last time before his former clients catch up to him.

S1 • E7
Markham must find out what connects three crank bombings?

S1 • E8
Markham is engaged by an insurance firm to investigate a series of jewel robberies. The thieves appear to be following directions given in a newspaper gossip column, which gives Markham a solid lead until his potential informant falls victim to the criminals.

S1 • E9
A beautiful woman comes to Markham's hotel room at night toting a gun and offering him a wad of cash to prove she didn't kill a man. Next day, Markham is arrested for murder. To prove his innocence, he will have to find the real killer.

S1 • E10
Nicky Schueller, a supposedly successful financier, kills himself while hosting a party in his home the night before his wedding. His employer hires Markham to find the money he embezzled.

S1 • E11
Markham is asked to protect a young girl.

S1 • E12
A young wife is cleared of foul play in the disappearance of her abusive husband. But what happened to the husband? And why are objects suddenly disappearing from the house?

S1 • E13
Several months after an expert stamp counterfeiter is found dead, counterfeit stamps are still being found that resemble his work. Also, two men are found murdered at his former boarding house.

S1 • E14
A refined gentleman meets a young blonde on an NYC street when they suddenly witness a murder. The gentleman is also quickly dispatched while the blonde flees. The gentleman's wife calls in Markham to find her missing husband.

S1 • E15
Roy travels to Mexico to help an old Priest friend who's boy is falsely charged with murder.

S1 • E16
While traveling in Central America, Markham helps a frantic tourist whose husband disappeared after climbing a wall to take pictures.

S1 • E17
Markham goes undercover as a carpenter at a Hollywood studio to catch a saboteur.

S1 • E18
Markham travels to Portugal to investigate the death of a young American woman.

S1 • E19
Markham is called upon when a famous actress is being stalked by an unknown man. She believes the stalker is her former protege and lover, but Markham will have to figure out if this is true.

S1 • E20
A young English girl has a large account in a Swiss bank and is anxious to withdraw the money without letting the British treasury department know about it.

S1 • E21
David Markham, a student at MIT is invited by a school friend to visit his eccentric uncle living in Louisiana. He accepts the invitation and then invites his uncle to accompany him.

S1 • E22
Kitty Brady, daughter of a trucker killed in an accident, tells Markham she thinks her father was murdered. Markham takes a job as a truck driver and recognizes one of the firm's mechanics as an old-time safecracker.

S1 • E23
An unknown disease infects the crew of a research ship.

S1 • E24
A wealthy shipping tycoon kills his young lover in a jealous rage. He uses his power to frame one of the victim's young lovers, but a wrench is thrown in his plan when the police suspect his son, who is yet another of the woman's lovers.

S1 • E25
A law school friend asks Roy Markham to quash rumors that his lady friend, the Bel-Air resident, killed her husband. The coroner ruled her husband's death a suicide. Roy is able to warn his friend that it was murder.

S1 • E26
Markham goes undercover as a diamond thief to retrieve a beautiful woman back to the U.S. from Mozambique so that she can testify against her mobster boyfriend.

S1 • E27
Markham comes home to find an unconscious, rich heiress and her three armed kidnappers. The crooks demand $500,000 for her return and know that her father will contact Markham for help since he'd worked for the family before. Knowing that they'll be killed after the ransom is paid, Roy schemes to overtake their captors with a well-timed explosion.

S1 • E28
Markham is enjoying a Hawaiian vacation on Oahu when he meets up with an old friend who believes his young wife is trying to kill him.

S1 • E29
A wealthy man hires Markham to protect him from an assassin by impersonating him. This also means Markham gets to escort his wife Friday, which proves to be an endless source of temptation.

S1 • E30
Markham is hired by an ex-convict to help him find his daughter, who he has never seen. All he knows is that the girl is living in a New York City slum.

S1 • E31
A young boy is the only witness to a mob hit, and now it is up to Markham to save the boy and his mother from the thugs.

S1 • E32
Markham flies to Honolulu to help Mary Cunningham, who lives in fear of her husband.

S1 • E33
Markham is attacked and wounded by an unknown assailant and he begins a search to discover who tried to kill him.

S1 • E34
Roy Markham anticipates a peaceful vacation in Florida, but a girl disturbs his tranquility and claims her life is in danger.

S1 • E35
A wealthy family hires Markham to watch their young daughter who they fear will either kill herself or have herself killed.

S1 • E36
Patricia Donahue plays a small-town girl working in the big city who falls for a married man with murder on his mind.

S1 • E37
Private investigator Roy Markham (Ray Milland) helps a woman, Nancy Booth (uncredited), once a famous actress, test her husband's faith in her by allowing her to use his engraved lighter and a handwritten letter from him. She leaves them in her penthouse and purse respectively, and her husband, a famous sculptor named Philip Booth (Robert H. Harris), finds them and kills her in a jealous rage. Booth then invites Markham over for dinner, and they play cat and mouse during cocktails, all of which culminates in Markham's discovering Nancy's dead body. The viewer then learns that Markham anticipated a confrontation with Booth, but never Nancy Booth's death. Markham had been in love with her for years, and when she came to him for help with her husband, he thought triggering a confrontation among all three parties would enable the Booths to disperse the jealousy and suspicion in their marriage. Booth has every intention of killing Markham, but Markham escapes. By maliakapalena.

S1 • E38
Markham is aboard The Arab Queen en route to Athens where he must figure out who is carrying a priceless scroll.

S1 • E39
Markham is hired to remove ghosts from a haunted house.

S1 • E40
Markham is in Paris looking for an old friend's missing daughter. At an art museum, he is tipped off that she is holed up on the Normandy coast with an artist.

S1 • E41
Looking forward to a fraternity reunion with his old fellow graduates, Markham discovers one of the brothers is suicidal and another has murder on his mind.

S1 • E42
Markham is called to the Middle East by an old buddy who is in trouble over an oil pipeline, however he can not decide if the man is trying to destroy it or protect it.

S1 • E43
A waterfront boss is marked for death by a young competitor.

S1 • E44
Markham receives a long distance call from Sylvia Lennard informing him she witnessed a gangland murder and has fled to Mexico to escape the killers.

S1 • E45
Markham investigates the mysterious disappearance of a distinguished author who was a likely candidate for the Nobel Prize.

S1 • E46
A D.A. is forced to drop his case against a known mobster when his daughter is kidnapped. The D.A. calls on Markham to find his daughter.

S1 • E47
An American tourist in Europe is heard to boast of his resemblance to a notorious criminal who's been deported from the United States. Not long after, the tourist mysteriously disappears.

S1 • E48
Someone is strangling rookie cops in an unnamed city. To quell accusations of inside corruption, independent investigator Roy Markham is brought in to solve the murders.

S1 • E49
Markham arrives in Rome to visit a friend only to find him murdered. To solve the murder, he infiltrates an escort service.

S1 • E50
Eight-year-old Judy Frost hasn't spoken a word or walked a step since her father died in a car accident. A poodle named "Sampson" is coaxing her out of her state of shock. But, one night, Sampson runs off. Can Markham find him?

S1 • E51

S1 • E52

S1 • E53
Markham's newspaper boy, Jimmy Standish, wants to prevent his mother from marrying a man named Guy Franklin. But what's the best way? Introduce her to a more desirable man -- Roy Markham, of course.

S1 • E54
Markham can easily see that the little country mouse whom the police have arrested for the murder of a night club owner could not possibly have done so. But he'll need to find the real killer himself since the police obviously won't.

S1 • E55

S1 • E56

S1 • E57

S1 • E58
Amy Rae, a famous singer, is receiving threatening notes, and her husband Tony goes to Roy Markham to find out who's sending them. Is his wife in danger?

S1 • E59

Roy Markham

John Riggs

Henry Cowell

Lt. Keough

Flora - Tourist

Capt. Hernando

Stephen Wallace

Mary Nicholson

Micheline

Clara Graves