Raoul Leduc is a police inspector trailing a spy who plots to kidnap an important American atomic scientist. Joe Victor a gangster who is hired to carry out the abduction, balks when he learns what is at stake and helps Leduc out instead.

Agnes "Astra" Huston, a fortune teller at a run-down fair, is found strangled in her bedroom. As the police question five suspects, their interactions with her are shown in flashbacks from their point of view.

An ex-con seeks revenge on the man who put him in prison by planning a robbery of the latter's stagecoach, which is transporting gold. He enlists the help of a partner, who could be working for his nemesis.

Eddie Darrow, seeking a mobster's widow in Macao, gets involved in a casino owner's affairs.

Steven Kenet, suffering from a recurring brain injury, appears to have strangled his wife. Having confessed, he's committed to an understaffed county asylum full of pathetic inmates. There, Dr. Ann Lorrison is initially skeptical about Kenet's story and reluctance to undergo treatment. But against her better judgement, she begins to doubt his guilt.

A newsman tracks down a phantom killer of murder-trial jurors.

Bank teller Mike Donovan (Barry Sullivan) takes the first step on the road to Perdition when he fails to report a $49,000 shortage. Accused of theft, Donovan is fired from his job. He is then prevented from finding other employment by Javert-like insurance investigator Gus Slavin (Charles McGraw). Despite many setbacks, Donovan attempts to clear his muddied name.

England, at the start of World War Two. Mysterious wireless broadcasts, apparently from Nazi Germany are heard over the BBC. They warn of acts of terror in England, just before they take place. Baffled, the Defense Committee call in Sherlock Holmes.

When a nobleman is threatened by a family curse on his newly inherited estate, detective Sherlock Holmes is hired to investigate.

Unsuccessful writer Aylmer Franklyn takes the chance to change identities after he discovers a corpse. However, he soon finds himself accused of the murder of a maid at a near-by boarding house.

After committing a murder, a man locks himself in his apartment and recollects the events that led him to the killing.

A criminal known as Thunderbolt is imprisoned and facing execution. Into the next cell is placed Bob Moran, an innocent man who has been framed and who is in love with Thunderbolt's girl, without knowing of their relationship. Thunderbolt hopes to stave off the execution long enough to kill young Moran for romancing his girl.