O'Hara teams with Joe Lew (George Takei) to take down a large drug shipment in LA.

Jim O'Hara goes undercover to stop a gun smuggling operation.

After arresting a forger when she tries to cash some stolen U.S. Savings Bonds, O'Hara persuades her to lead him the source of a counterfeit ring.

Two petty thieves see a chance to make it big by expanding to extortion. But in doing so they are ruining the career of a treasury agent.

O'Hara poses as a drifter and joins a small band of flower children in the desert. He must undercover the location in a nearby city where they planted a bomb and are extorting $200,000 from a publisher.

An aging stripper and a mob strongman figure in a Boston counterfeiting ring.

A carnival pitchman seems on the verge of revealing Jim O'Hara's cover as he attempts to trail a half-million dollars' worth of heroin from Mexico.

When a professional sports bettor's wife tells O'Hara her husband might be a tax evader he investigates. He finds a world filled with people on the make and who don't brag about their winnings.

Posing as a truck driver, O'Hara and a psychotic thief (Victor French) drive cross-country with a van loaded with stolen government high explosives.

When valuable international imports start disappearing, O'Hara works with customs agents Hazard and Miles to find and catch the thieves.

While probing for evidence of Federal income tax violations Jim O'Hara runs afoul of a small town power broker and becomes the target of veiled threats against his life by the citizens of a small town.

O'Hara presents himself as a avaricious Internal Revenue Service official to nab a tax evading mobster.

O'Hara goes after a bootlegger whose bad whiskey - poisoned with lead salts - has already caused the deaths of a half-dozen of his customers.

While posing as an arms dealer Jim O'Hara pursues the source of an unfamiliar machine gun model that is turning up in crimes.

Ricardo Montalban plays a compulsive gambler out to build a stake by selling a million dollars in counterfeit bills.

After a fisherman is slain Jim O'Hara launches an investigation to find the smuggler he suspects is responsible for three brutal murders.

O'Hara accompanies a diamond broker (Joseph Wiseman) to Africa to investigate his claim that he is a pawn in a smuggling scheme, however he has a suspicion that he is being set up.

Jessica Tandy stars as an elderly but peppery former Parisian artist's model who assists O'Hara in building his case of income tax evasion against a racketeer specializing in art swindles.

The ex-wife of a nightclub comic (Godfrey Cambridge) reports to O'Hara that her husband has arranged to deliver a bribe to an Internal Revenue Service man in return for the cancellation pf a scheduled IRS audit of his income.

O'Hara pursues an engraver and printer of high-grade counterfeit currency.

O'Hara is approached by Laura Alpin who's the wife of mob racketeer Mike. Fed up with her husband's cheating on her she's ready to give evidence of his tax evasion. Mike decides to take measures to prevent his probable prison life.

O'Hara goes under cover as a dealer at a casino, to investigate and stop a multi million dollar money skimming operation.