Holmes, retired to Sussex, is drawn into a last case when his arch enemy Moriarty arranges with an American gang to kill one John Douglas, a country gentleman with a mysterious past. Holmes' methods baffle Watson and Lestrade, but his results astonish them. In a long flashback, the victim's wife tells the story of the sinister Vermissa Valley.
Unfortunately the movie The Triumph of Sherlock Holmes is not yet available on HBO Max.
| Directing | Leslie S. Hiscott | Director |
| Writing | Arthur Conan Doyle | Novel |
| Writing | H. Fowler Mear | Adaptation |
| Production | Julius Hagen | Producer |
| Crew | William Luff | Cinematography |
| Editing | Ralph Kemplen | Editor |
| Art | James A. Carter | Art Direction |
| Directing | James Davidson | Assistant Director |
| Sound | W.L. Trytel | Music Director |
| Sound | Baynham Honri | Sound Recordist |
| Sound | Leo Wilkins | Sound Recordist |
