Adaptation of an Arthur Conan Doyle novel, in which Sherlock Holmes and Dr. Watson investigate the secret of a wealthy businessman.
John Longden
Sherlock Holmes
Campbell Singer
Dr. Watson
Hector Ross
Neville St. Clair
Ninka Dolega
Kate St. Clair
Beryl Baxter
Doreen
Walter Gotell
Luzatto
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