Richard Francis Heritage

James Mason

Laura Verity

Joyce Howard

Lady with Dog

Jeanne De Casalis

Mary, Manicurist (as Pat Medina)

Patricia Medina

Pawnbroker

George Robey

Max - Mouth Harmonica Player

Ronald Chesney

Bobby

Peggy Dexter

Merchant Captain

Finlay Currie

Detective Inspector Burrows

Brefni O'Rorke

Benson - Illusionist

Eric Mason

Hotel Hairdresser

Anthony Holles

Ian Fleming

Christopher Child

Tom Walls

Naval Officer in Charge of Court Martial

Kynaston Reeves

Van Driver

Herbert Lomas

Police Sergeant

Percy Walsh

Code Expert

Terence de Marney

Elizabeth Flatau

Pub Owner

Charles Victor

Petty Officer Bill Grant

Robert Sansom

Boothby - Radio Announcer

Alvar Liddell

2nd Code Expert

Anthony Dawson

One of Mansel's Tough Friends (uncredited)

Alf Goddard

Lily Bernard

Phyllis Stanley

Henry (uncredited)

David Keir

Defence Lawyer at Court Martial (uncredited)

Jack Melford

Waiter (uncredited)

Hay Petrie

Bus Conductor (uncredited)

Leonard Sharp

George the Barman (uncredited)

Dennis Wyndham

Mansel

Edward Rigby

Carter

Ronald Ward

Commander Lippinscott

David Farrar

Riccardo

Karl Stepanek

Fay

Betty Warren

Charlie

Walter Crisham

Director

Karel Lamač

Writer

Miles Malleson

Novel

Anthony Gilbert