In World War II, a British secret agent carrying a vitally important document is kidnapped en route to Washington. The British government calls on Sherlock Holmes to recover it.
| Writing | Bertram Millhauser | Writer |
| Directing | Roy William Neill | Director |
| Writing | Arthur Conan Doyle | Characters |
| Writing | Bertram Millhauser | Screenplay |
| Writing | Lynn Riggs | Screenplay |
| Writing | Bertram Millhauser | Original Story |
| Camera | Lester White | Director of Photography |
| Production | Howard Benedict | Associate Producer |
| Production | Roy William Neill | Producer |
| Sound | Frank Skinner | Music |
| Editing | Otto Ludwig | Editor |
| Art | Jack Otterson | Art Direction |
| Art | Russell A. Gausman | Set Decoration |
| Costume & Make-Up | Vera West | Costume Design |
| Directing | William Tummel | Assistant Director |
