In a vein similar to Bond movies, a British agent Philip Calvert is on a mission to determine the whereabouts of a ship that disappeared near the coast of Scotland.
| Writing | Alistair MacLean | Novel |
| Directing | Étienne Périer | Director |
| Writing | Alistair MacLean | Screenplay |
| Production | Denis Holt | Associate Producer |
| Art | Jack Maxsted | Art Direction |
| Production | Elliott Kastner | Producer |
| Costume & Make-Up | Sue Yelland | Costume Design |
| Sound | Angela Morley | Original Music Composer |
| Editing | John Shirley | Editor |
| Production | Ted Lloyd | Production Supervisor |
| Production | Malcolm J. Christopher | Location Manager |
| Camera | David Wynn-Jones | Assistant Camera |
| Crew | Les Hillman | Special Effects |
| Crew | Walter Stott | Compositor |
| Camera | Arthur Ibbetson | Director of Photography |
