Trailer
Images
 | James Mason as Cmdr. Max Easton |
 | George Sanders as Sir Charles Holland |
 | Vera Miles as Virginia Killain |
 | Robert Flemyng as Cmdr. John Larkin |
 | Oliver Johnston as Minister |
 | William Kendall as Tom |
 | Duncan Lamont as 1st Special Branch man Gregson |
 | Harry Andrews as Capt. Graham |
 | Peter Barkworth as Sub Lt. Brown |
 | Rachel Gurney as Clara Holland |
 | Martin Stephens as John Holland |
| Waveney Lee as Marcia Holland |
 | Charles Carson as Robert Holland |
 | Junia Crawford as Susan |
| Henry B. Longhurst as Club Member (as Henry Longhurst) |
 | Roger Maxwell as Club Member |
| Gerald Case as Club Member |
 | Donald Bisset as Club Member |
 | Desmond Roberts as Club Member |
| Reginald Smith as Club Steward |
| Rosemary Dorken as WREN Officer |
 | MacDonald Parke as Jason Parrish (as Macdonald Parke) |
 | Mavis Villiers as Adele Parrish |
 | Ernest Clark as Cmdr. Bates |
| Alexander Archdale as Local Doctor (uncredited) |
 | Basil Dignam as Lt. Cmdr. Evans at P.R.O. (uncredited) |
| Mabel Etherington as Nightclub Patron (uncredited) |
 | Gordon Harris as 2nd Special Branch Man Jones (uncredited) |
 | Barbara Hicks as Miss Price (uncredited) |
 | John Horsley as 1st Editor (uncredited) |
| Frederick Kelsey as Club Member (uncredited) |
 | John Le Mesurier as Head of the Admiralty (uncredited) |
 | Ronald Leigh-Hunt as 2nd Editor (uncredited) |
 | Richard Marner as Russian Officer Cornered by Max Easton (uncredited) |
 | William Mervyn as Capt. Balfour (uncredited) |
| Andre Mikhelson as 2nd Russian Officer (uncredited) |
| John More as American General at Embassy Party (uncredited) |
| Dickie Owen as 2nd Policeman (uncredited) |
 | Frederick Piper as Hall Porter (uncredited) |
 | Pat Ryan as Nightclub Patron (uncredited) |
| Stanley Zevic as 1st Russian Officer (uncredited) |
| Directing | |
| Guy Hamilton | Director |
Writing | |
| Paul Winterton | Novel |
Sound | |
| Philip Green | Original Music Composer |
Writing | |
| Roger MacDougall | Screenplay |
| Ivan Foxwell | Writer |
| Guy Hamilton | Writer |
Production | |
| Ivan Foxwell | Producer |
Camera | |
| John Wilcox | Director of Photography |
Editing | |
| Alan Osbiston | Editor |
Production | |
| Irene Howard | Casting |
Art | |
| Reg Bream | Draughtsman |
| Elliot Scott | Art Direction |
Directing | |
| Charles Blair | Second Assistant Director |
Production | |
| Noreen Hipwell | Production Secretary |
