The name Michael O'Hara has become synonymous with law enforcement. There have been three generations of Michael O'Haras and all have been exemplary policemen. When Michael O'Hara III's child was born he was told that they would not be able to have any more children, and there has always been a Michael O'Hara, so he named his child Michael O'Hara IV despite the fact that she is a girl. Now Mike has a tendency to get involved with police matters and not always with good results, which annoys her father. And despite being told repeatedly to stay out of it, she continues her amateurish detective activities.

When King's beloved horse dies, Princess tries to purchase a new nag, and that's how she inadvertently gets her hands on a "stolen" race horse. Our heroine nearly ends up with a lengthy prison term before the story is resolved during the climactic Big Race.

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A detective courts a gangster's ex-wife to lure him into a trap.

An unwitting woman marries a psychopathic serial killer.

A wealthy woman's wild lifestyle finally drives her husband to take their two children, move out of the house and file for divorce. Positive she'll lose her children unless she shows the judge that she's changed her wild ways, she takes in two poor street kids, a brother and sister.

A young crippled girl and her love for a teenage newsboy despite her over-protective and alcoholic mother's objections.

The bags belonging to a young man about to break up with his lover, two bumbling criminals planning a bomb blast, a man circulating counterfeit currency, and a couple paying ransom to save their daughter get mixed up leading to so much confusion.

O'Hara, U.S. Treasury is an American television crime drama starring David Janssen and broadcast by CBS during the 1971-72 television season. Jack Webb's Mark VII Limited packaged the program for Universal Television. Webb and longtime colleague James E. Moser created the show; Leonard B. Kaufman was the producer. The series was produced with the full approval and cooperation of the United States Department of the Treasury.

American journalist gets a sensational material but is afraid to publish it...