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.

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James Mason

Robert Leyland

Viki Dobson

Barbara Standish

Eddie Pola

'Terrible' Tony Canzari

Finlay Currie

Al Parson

John Warwick

Eddie 'Babyface' Fallon

Margaret Rutherford

'Crafty' Maggie Carberry

Paul Blake

Cornwallis

James Mageean

Ben

Eva Hudson

Manzanilla

Paul Sheridan

Fournival

Peter Popp

Bertram Plush

Bernard Merefield

Mr Lowry, Ship's Purser

Charles Sewell

Ship's Captain

Zoe Wynn

Lenore Kendall

Jack Lester

Superintendent Welbekker

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