Two men working on the docks close to London's Tower Bridge find the body of an unidentified man floating in the Thames. The police later identify the body to be that of a diamond courier from Holland. The police have to find his murderer, as well as the missing diamonds he was carrying.
| Directing | Vernon Sewell | Director |
| Writing | Nicolas Bentley | Novel |
| Writing | Vernon Sewell | Screenplay |
| Production | William H. Williams | Producer |
| Camera | Josef Ambor | Director of Photography |
| Editing | Geoffrey Muller | Editor |
| Production | Ronnie Curtis | Casting |
| Art | Harold Watson | Art Direction |
| Costume & Make-Up | Jack Craig | Makeup Artist |
| Costume & Make-Up | Jayne Seymour | Hairstylist |
| Camera | Ron Robson | Camera Operator |
| Camera | Charles Trigg | Still Photographer |
| Directing | Pamela Gayler | Continuity |
| Costume & Make-Up | Elsie Curtis | Wardrobe Master |