| Person | Type | Job | Role(s) |
|---|---|---|---|
 Anthony Gilbert | Crew | Writing | Novel |
 Karel Lamač | Crew | Directing | Director |
 Miles Malleson | Crew | Writing | Writer |
 Alf Goddard | Cast | Actor | One of Mansel's Tough Friends (uncredited) |
 Anthony Dawson | Cast | Actor | 2nd Code Expert |
Anthony Holles | Cast | Actor | Hotel Hairdresser |
 Betty Warren | Cast | Actress | Fay |
 Brefni O'Rorke | Cast | Actor | Detective Inspector Burrows |
 Charles Victor | Cast | Actor | Pub Owner |
 David Farrar | Cast | Actor | Commander Lippinscott |
David Keir | Cast | Actor | Henry (uncredited) |
 Dennis Wyndham | Cast | Actor | George the Barman (uncredited) |
 Edward Rigby | Cast | Actor | Mansel |
Eric Mason | Cast | Actor | Benson - Illusionist |
 Finlay Currie | Cast | Actor | Merchant Captain |
 George Robey | Cast | Actor | Pawnbroker |
 Hay Petrie | Cast | Actor | Waiter (uncredited) |
 Herbert Lomas | Cast | Actor | Van Driver |
 Jack Melford | Cast | Actor | Defence Lawyer at Court Martial (uncredited) |
 James Mason | Cast | Actor | Richard Francis Heritage |
 Jeanne De Casalis | Cast | Actress | Lady with Dog |
 Joyce Howard | Cast | Actress | Laura Verity |
 Karl Stepanek | Cast | Actor | Riccardo |
 Kynaston Reeves | Cast | Actor | Naval Officer in Charge of Court Martial |
Leonard Sharp | Cast | Actor | Bus Conductor (uncredited) |
 Patricia Medina | Cast | Actress | Mary, Manicurist (as Pat Medina) |
Percy Walsh | Cast | Actor | Police Sergeant |
 Phyllis Stanley | Cast | Actress | Lily Bernard |
Robert Sansom | Cast | Actor | Petty Officer Bill Grant |
Ronald Chesney | Cast | Max - Mouth Harmonica Player | |
 Ronald Ward | Cast | Actor | Carter |
 Terence de Marney | Cast | Actor | Code Expert |
 Tom Walls | Cast | Actor | Christopher Child |
 Walter Crisham | Cast | Charlie | |
 Ian Fleming | Cast | Actor | |
Alvar Liddell | Cast | Actor | Boothby - Radio Announcer |
Elizabeth Flatau | Cast | ||
Peggy Dexter | Cast | Bobby | |
| Person | Type | Job | Role(s) |
