James Mason ( James Mason )

Richard Francis Heritage

Joyce Howard ( Joyce Howard )

Laura Verity

Tom Walls ( Tom Walls )

Christopher Child

Phyllis Stanley ( Phyllis Stanley )

Lily Bernard

Edward Rigby ( Edward Rigby )

Mansel

Ronald Ward ( Ronald Ward )

Carter

David Farrar ( David Farrar )

Commander Lippinscott

Karl Stepanek ( Karl Stepanek )

Riccardo

Betty Warren ( Betty Warren )

Fay

Walter Crisham ( Walter Crisham )

Charlie

Jeanne De Casalis ( Jeanne De Casalis )

Lady with Dog

Patricia Medina ( Patricia Medina )

Mary, Manicurist (as Pat Medina)

George Robey ( George Robey )

Pawnbroker

Ronald Chesney ( Ronald Chesney )

Max - Mouth Harmonica Player

Peggy Dexter ( Peggy Dexter )

Bobby

Finlay Currie ( Finlay Currie )

Merchant Captain

Brefni O'Rorke ( Brefni O'Rorke )

Detective Inspector Burrows

Eric Mason ( Eric Mason )

Benson - Illusionist

Anthony Holles ( Anthony Holles )

Hotel Hairdresser

Ian Fleming ( Ian Fleming )

Kynaston Reeves ( Kynaston Reeves )

Naval Officer in Charge of Court Martial

Herbert Lomas ( Herbert Lomas )

Van Driver

Percy Walsh ( Percy Walsh )

Police Sergeant

Terence de Marney ( Terence de Marney )

Code Expert

Elizabeth Flatau ( Elizabeth Flatau )

Charles Victor ( Charles Victor )

Pub Owner

Robert Sansom ( Robert Sansom )

Petty Officer Bill Grant

Alvar Liddell ( Alvar Liddell )

Boothby - Radio Announcer

Anthony Dawson ( Anthony Dawson )

2nd Code Expert

Alf Goddard ( Alf Goddard )

One of Mansel's Tough Friends (uncredited)

David Keir ( David Keir )

Henry (uncredited)

Jack Melford ( Jack Melford )

Defence Lawyer at Court Martial (uncredited)

Hay Petrie ( Hay Petrie )

Waiter (uncredited)

Leonard Sharp ( Leonard Sharp )

Bus Conductor (uncredited)

Dennis Wyndham ( Dennis Wyndham )

George the Barman (uncredited)