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E1 Getaway Day
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E2 The Casino
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E3 The Frame
Undercover agent Nick Stone infiltrates a gang of jewel thieves to find evidence that a man convicted of murder during a jewel robbery is actually innocent.
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E4 Stand on Velvet
The agent joins the gang of William Kane, their objective is to run the leader of the numbers racket out of town.
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E5 The Cracking Point
The undercover agent joins in on a robbery.
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E6 Thousand Dollar Bill
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E7 Music and Mink
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E8 Man in the Middle
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E9 The Patsy
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E10 The Money Fight
After a boxer is killed for not throwing a fight as ordered, Nick goes undercover by taking over as manager for another young prizefighter, planning eventually to get him to turn evidence against the crooked promoter who ordered the killing.
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E11 Black Tie Kill
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E12 The Perfect Circle
Barney MacCready puts his train-robbery plan into action. First he kidnaps a detective, then he has two of his henchmen board the train one posing as the missing detective the other as his prisoner.
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E13 The Lady
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E14 Cold Kill
An undercover agent assumes the identity of a killer hired to rub out a murder witness. But the intended victim is hiding, and the first task is to smoke him out.
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E15 The Neon Wheel
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E16 Two Private Eyes
Sam Keely and Jeff Stewart are a bit on the shady side. The undercover agent's strategy is to muscle in on their racket.
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E17 Night of the Gun
Dan Hawley and David Johnson, witnesses to a murder committed by gangster Jimmy Farrow, are a target for Larry Maddox, a hired killer. After Maddox kills Hawley, police take Johnson's wife and children into protective custody. Johnson, fearing for his life, goes into hiding. Nick is put on the case.
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E18 Broken Rope
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E19 Cold Ice
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E20 Appointment in Jericho (a.k.a. Assignment in Jericho)
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E21 Three to Make Ready
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E22 The Model and the Mobster
Mobster Sid Zero is a man who gets what he wants in business and women by using muscle, threats, and, if necessary, murder. Nick goes undercover to bring him down, and tries to get the help of the latest young model Zero has forced into becoming his mistress.
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E23 The Long Odds
A detective assigned to investigate a phoney health club is killed by one of the club owners. An undercover agent follows up, convincing the gangsters that he's a gambler on the run.
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E24 The Brave Pigeon
Underworld leader Max Rommey wants Paul Anderson dead. To protect Anderson, the undercover agent becomes part of Rommey's gang.
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E25 First Time Out
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E26 Park Avenue Story
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E27 Big Business
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E28 The Chinese Pendant
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E29 Achilles and His Heels
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E30 The Gangster's Daughter
The first step for Nick in infiltrating Vince Baron's gang is foiling the attempted kidnapping of Baron's daughter. He must also contend with a young upstart who wants to push Baron out as leader. What Nick was not expecting was to fall for the daughter.
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E31 The Penthouse Story
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E32 The Shark
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E33 The Horse Runs High
The undercover agent is assigned to break up a gambling ring that bets heavily on certain horses--and then makes sure they win by doping them.
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E34 The Hired Guns
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E35 Borderline
The undercover agent is assigned to smash a dope ring that sells to Americans from a base in Mexico.
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E36 A Matter of Money
Nick is assigned to break up a gang headed by Steve Taylor. This particularly unsavory gang uses threats and violence to force small shopkeepers to pay for protection.
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E37 Bullets and Ballet