Undercover agent Robert Leyland entraps crooks trying to sneak expensive goods past customs on transatlantic crossings. After Leyland falls for reluctant smuggler Barbara Standish, he convinces her to return with him to France with her cache of diamonds. But she is unaware of a network of thieves onboard their ship, competing against each other to make off with her jewels.
as Robert Leyland
as Barbara Standish
as 'Terrible' Tony Canzari
as Al Parson
as Eddie 'Babyface' Fallon
as 'Crafty' Maggie Carberry
as Cornwallis
as Ben
as Manzanilla
as Fournival
as Bertram Plush
as Mr Lowry, Ship's Purser
as Ship's Captain
as Lenore Kendall
as Superintendent Welbekker
