When a corpse is found in the Thames, the only clue is that the dead man was killed by a karate or judo expert.
| Directing | Clive Donner | Director |
| Writing | Robert Banks Stewart | Writer |
| Editing | Derek Holding | Editor |
| Crew | Bert Mason | Cinematography |
| Production | Jim O'Connolly | Associate Producer |
| Writing | Edgar Wallace | Novel |
| Production | Jack Greenwood | Producer |
| Art | Peter Mullins | Art Direction |
| Sound | Charles Blackwell | Original Music Composer |
