Ed Harwood, a wisecracking private investigator from New York, discovers a crime at a hotel in Nice during a carnival. The unraveling of the mystery which lies behind will lead him and Caryl Fenton, a female insurance agent, who will become his companion, first to Paris, then to London, later through the English countryside and finally to Southampton, in search of a criminal train wrecker.

A Colonel's daughter steals from the regimental mess funds to pay off her gambling debts. One of the officers, who is love with her, takes the blame, and is sent to Africa.

Bulldog Drummond forms a gang to rescue his wife and thwart his nemesis, Carl Peterson.

Two insurance detectives work with the police to identify and bring down a crime kingpin. One is murdered, but his partner and his daughter continue.

An overheard conversation leads to clues that a kidnapping plot is afoot.

Singing Marseilles docker Joe is hired by wealthy English couple, the Oliphants, to find their missing son Gerald. When Joe finds him, he learns Gerald escaped of his own will and takes him to stay with a local singer, who offers a refuge from his repressed white parents.

Singing Marseilles docker Joe is hired by wealthy English couple, the Oliphants, to find their missing son Gerald. When Joe finds him, he learns Gerald escaped of his own will and takes him to stay with a local singer, who offers a refuge from his repressed white parents.

Bulldog Drummond forms a gang to rescue his wife and thwart his nemesis, Carl Peterson.

Ed Harwood, a wisecracking private investigator from New York, discovers a crime at a hotel in Nice during a carnival. The unraveling of the mystery which lies behind will lead him and Caryl Fenton, a female insurance agent, who will become his companion, first to Paris, then to London, later through the English countryside and finally to Southampton, in search of a criminal train wrecker.