Lloyd Nolan is back as detective Michael Shayne who's in search of a stolen coin.

For years, a blackmailer has been preying on the weaknesses of others throughout London. When Holmes hears of the utter misery this mystery man is creating, he adopts a campaign to thwart his evil scheming. The campaign astonishes Dr. Watson by its strangeness and finds Holmes falling in love.

Newspaper reporter Tim Rourke keeps writing articles that attack the police department for its failure to solve a chain of murders, which nearly leads to the reporter's death. He calls in private detective Michael Shayne, who turns up a blonde and a blackmailer.

Sherlock Holmes investigates when young women around London turn up murdered, each with a finger severed. Scotland Yard suspects a madman, but Holmes believes the killings to be part of a diabolical plot.

A detective's wedding is postponed when gunshots are heard nearby.

Bernard meets Jane in a Night Club, in London, and he likes her. Her father was killed in a car accident, but Jane thinks he has been killed because he was blackmailed for a picture of his second wife, Jane's mother in law. In the same Night Club Bernard finds the blackmailer corpse and Jane near him, but he believes she is innocent. So Bernard and Jane run away followed by a dwarf, the blackmailer's men, who believe Bernard killed their boss and of course, the Police. They believe that Jerome, Jane's brother, can help them to solve the case. But Jane doesn't know where he is, or so she says. Corpse after corpse, Bernard will find out the truth. But will the truth help him?

Private detective Michael Shayne is on the case again, but this time he's stuck on a jury for a murder trial. So, what does he do? Why, he skips out on sequestration in order to solve the case himself!

Private eye Mike Shayne encounters a large amount of trouble while attempting to guard a murder witness.

Unknown to Joan Manning, her trading post partner Weathers is operating a counterfeiting ring. When miner Jim Smithers brings his gold dust in, Weathers pays him off in counterfeit money. Jim's drunken brother, Bill, comes to the post and Weathers hears him say that Jim is leaving the area for good. Weathers sends Hawks to kill Jim and retrieve the bogus money. RCMP Sergeant Renfrew and Constable Kelly find Jim's body, and Renfrew hurries for Jim's cabin to search it. He is attacked by Weathers' men who have found the money. Renfrew is suspicious when Bill Smithers body is found, supposedly a suicide, with a note he had burned the money. This leads the Mounties to suspect counterfeiting. Kelly follows Manti, an Indian who works for Weathers, to the gang's hideout and is captured. But Renfrew is trailing Kelly.

A British reporter and his wife, on vacation in Paris, run into a gang of counterfeiters.

Millionaire sportsman Hiram Brighton hires gumshoe Michael Shayne to keep his spoiled daughter Phyllis away from racetrack betting windows and roulette wheels. After Phyllis slips away and continues her compulsive gambling, Shayne fakes the murder of her gambler boyfriend, who is also romancing the daughter of casino owner Benny Gordon, in order to frighten her. When the tout really ends up murdered, Shayne and Phyllis' Aunt Olivia, an avid reader of murder mysteries, both try to find the identity of the killer.

A man believed to be dead and buried escapes from his grave and returns to the scene of the crime seeking revenge.