The Toff solves the mystery of a missing employer. One of the BFi's most wanted films.

A husband-and-wife detective team look into the murder of one of her friends, whose father--a prominent scientist--has been kidnapped. They find themselves up against a sinister crime organization headed by a mysterious figure known only as "Z".

Jane is given a bracelet by an elderly admirer. He is in league with Cleaver, a suave crook, and the two plan to use Jane and the bracelet to smuggle diamonds into England.

A young boxer falls in with a crooked fight promoter.

The scene of action embraces Tangier, Toulon and the Mediterranean, where Pierre Fresnay, Rolf Wanka and Kim Peacock, cast as captains of French, German and English boats, respectively, unite to rescue the passengers of a neutral boat that is about to be engulfed in a cloud of poison smoke released by a smuggling ship.