When a woman is found dead with her throat torn out, the local villagers blame a supernatural monster. But Sherlock Holmes, who gets drawn into the case from nearby Quebec, suspects a human murderer.
| Directing | Roy William Neill | Director |
| Writing | Roy William Neill | Screenplay |
| Writing | Arthur Conan Doyle | Characters |
| Camera | George Robinson | Director of Photography |
| Writing | Edmund L. Hartmann | Screenplay |
| Writing | Brenda Weisberg | Story |
| Writing | Paul Gangelin | Story |
| Production | Roy William Neill | Producer |
| Sound | Paul Sawtell | Original Music Composer |
| Editing | Paul Landres | Editor |
| Art | Ralph M. DeLacy | Art Direction |
| Art | John B. Goodman | Art Direction |
