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.
Harwood

Caryl Fenton

Paul Turbé

Axel Hoyt

Sir Charles Webber

Registrar

Wagner

Reception Clerk
Hotel Manager

Guildhall Guide
Vicar

Housekeeper (Uncredited)
Pilgrims of Peace Poet (Uncredited)

Irate Bridge Player (Uncredited)
Elizabeth Wentworth