Trailer
Images
 | Anthony Hopkins as Philip Calvert |
 | Robert Morley as Uncle Arthur |
 | Nathalie Delon as Charlotte |
 | Jack Hawkins as Sir Anthony Skouras |
 | Corin Redgrave as Hunslett |
 | Derek Bond as Lord Charnley |
 | Ferdy Mayne as Lavorski |
 | Maurice Roëves as Lt. Williams - Helicopter Pilot |
 | Leon Collins as Tim Hutchinson |
 | Wendy Allnutt as Sue Kirkside |
 | Peter Arne as Capt. Imrie |
 | Oliver MacGreevy as Quinn |
| Jon Croft as Durran |
| Tom Chatto as Lord Kirkside |
| Charlie Stewart as Sgt. Macdonald |
 | Edward Burnham as Macullum |
 | Del Henney as Dungeon Guard |
 | Bill Brandon as Thug (uncredited) |
| Harry Fielder as Thug on Boat (uncredited) |
| Martin Grace as Thug (uncredited) |
 | Charles Gray as Sir Anthony Skouras (voice) (uncredited) |
 | Prentis Hancock as Agent (uncredited) |
| Barrie Hesketh as Seaman (uncredited) |
| George Leech as Thug (uncredited) |
| Writing | |
| Alistair MacLean | Novel |
Directing | |
| Étienne Périer | Director |
Crew | |
| Walter Stott | Compositor |
Camera | |
| Arthur Ibbetson | Director of Photography |
Costume & Make-Up | |
| Sue Yelland | Costume Design |
Production | |
| Malcolm J. Christopher | Location Manager |
| Elliott Kastner | Producer |
Art | |
| Jack Maxsted | Art Direction |
Editing | |
| John Shirley | Editor |
Production | |
| Denis Holt | Associate Producer |
Sound | |
| Angela Morley | Original Music Composer |
Production | |
| Ted Lloyd | Production Supervisor |
Camera | |
| David Wynn-Jones | Assistant Camera |
Crew | |
| Les Hillman | Special Effects |
