The discovery of a corpse and the ensuing probe by an idealistic journalist threatens to unravel a bumbling local politician's campaign for governor of Colorado.

A middle-aged playboy becomes fascinated by the daughter of a private detective who has been hired to entrap him with a client's wife.

Mr. Hammer, a private detective, is hired to find a monster terrorizing a nudist colony and his wife is very eager to tag along.

In the second screen version of The Maltese Falcon, a detective is caught between a lying seductress and a lady jewel thief.

Before he left for a brief European visit, symphony conductor Sir Alfred De Carter casually asked his staid brother-in-law August to look out for his young wife, Daphne, during his absence. August has hired a private detective to keep tabs on her. But when the private eye's report suggests Daphne might have been canoodling with his secretary, Sir Alfred begins to imagine how he might take his revenge.

John Rosow drinks to forget. He is a former New York City cop turned Chicago-based private investigator. At the last minute, he is hired by someone he's never met to follow a middle-aged male subject on the soon-departing California Zephyr train to Los Angeles.

New York's Odyssey Detective Agency is hired by two different clients to follow two women suspected of infidelity. Ladies' man John Russo trails Angela Niotes, the elegant wife of a wealthy Italian industrialist, while Charles Rutledge and Arthur Brodsky follow Dolores Martin, the beautiful young wife of a jealous husband. Their respective cases are complicated when John falls for Angela, and Charles falls for Dolores.

Inept private investigator Harry Dobbs meets vampish new client Miss Dolan, who wants him to follow her abusive lover. But Dobbs sets about tailing a different person entirely – a mysterious character leading a double life. Harry, however, discovers that he himself is being followed by a distaff gumshoe.

Ned Ravine is a police officer and lawyer who occasionally defends the delinquents he arrests. He crosses paths with seductive Lola Cain during an assignment and promptly begins an affair with her. Meanwhile, Ned's wife, Lana, is deep in an affair of her own. Lana and her lover are planning to murder Ned in an elaborate fashion so they can collect on his triple indemnity life insurance policy.

Browning is a PI with a bad cold, who's sent to investigate a case by a mysterious client. He stumbles across the body of a young woman and is stabbed to death, and when he wakes up in heaven, they tell him he's "marginal material," and they can only decide on his final destination through one last assignment: to go back and solve his own murder. As a dog. A cute fluffy little dog (Benji). Undaunted, Browning begins to investigate the case as best he can around his canine disabilities (dialing the phone presents a special challenge) to solve the murders, save the girl, and see justice done.

An active building contractor hires a failed private detective, Pantelis. His mission is to sabotage her competitor, Bastounas, who is planning to build a hotel complex. When Bastounas forgets the suitcase with the money for the purchase of the land on which the hotel will be built, Pantelis will do everything he can to delay his secretary, who is responsible for delivering the money to him.

Burnt-out private dick Jacob Aloysius Spanner teams up with his brother to help an old adversary track down his one remaining loved one, his kidnapped granddaughter. But who's the hood and who's being hoodwinked?