Adaptation of an Arthur Conan Doyle novel, in which Sherlock Holmes and Dr. Watson investigate the secret of a wealthy businessman.
| Actor | Role |
|---|---|
 John LongdenSherlock Holmes | Sherlock Holmes |
 Campbell SingerDr. Watson | Dr. Watson |
 Hector RossNeville St. Clair | Neville St. Clair |
| NNinka DolegaKate St. Clair | Kate St. Clair |
 Beryl BaxterDoreen | Doreen |
 Walter GotellLuzatto | Luzatto |