When Kirk Bennett is convicted of a singer's murder, his wife tries to prove him innocent...aided by the victim's ex-husband.

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

Sherlock Holmes investigates a series of deaths at a castle with each foretold by the delivery of orange pips to the victims.

Holmes is recruited to escort the heir to a European throne safely back to his homeland after his father's assassination.

Sherlock Holmes takes on a case that the press has dubbed the pajama suicides. Eminent men are going to bed in the safety of their own homes, with everything seemingly being normal, only to commit suicide in the night. Holmes fakes his own death in the hopes of giving him a freer hand in the investigation and is convinced that a woman, a female Moriarty as he describes her, is behind the deaths. The dead men were all eminent and very wealthy. He impersonates a wealthy retired Indian military officer in the hope of drawing out the woman and he soon meets Adrea Spedding but she quickly sees through his disguise and proves herself to be the challenge Holmes predicted she would be. She is a worthy adversary and soon traps him setting him up in a carnival shooting gallery that seems to assure his death.

When a gentlewoman is found dead with her throat torn out, the villagers blame a supernatural monster, but Sherlock Holmes, who gets drawn into the case from nearby Quebec, suspects a human murderer.

Detective Mark McPherson investigates the killing of Laura, found dead on her apartment floor before the movie starts. McPherson builds a mental picture of the dead girl from the suspects whom he interviews. He is helped by the striking painting of the late lamented Laura hanging on her apartment wall. But who would have wanted to kill a girl with whom every man she met seemed to fall in love? To make matters worse, McPherson finds himself falling under her spell too. Then one night, halfway through his investigations, something seriously bizarre happens to make him re-think the whole case.

Paula's aunt, Alice Alquist, a famous entertainer, is murdered in her home. Paula, who lives with her aunt, finds the body. Police fail to find the killer, and Paula is sent away to school. Ten years later, Paula returns to London with her new husband. They take up residence in her aunt's house, which she has inherited. Paula is increasingly isolated by her husband but does come to the attention of an admirer of her aunt, Mr. Brian Cameron.

Mortimer Brewster is a newspaperman and author known for his diatribes against marriage. We watch him being married at city hall in the opening scene. Now all that is required is a quick trip home to tell Mortimer's two maiden aunts. While trying to break the news, he finds out his aunts' hobby; killing lonely old men and burying them in the cellar. It gets worse.