When a couple of scammers hold young Alice Faulkner against her will to discover the whereabouts of letters whose dissemination could cause a scandal affecting the royal family, Sherlock Holmes decides to take over the case. (Considered lost, a copy was found in 2014, in the vaults of the Cinémathèque Française.)
William Gillette
as Sherlock Holmes
Ernest Maupain
as Professor Moriarty
Marjorie Kay
as Alice Faulkner
Edward Fielding
as Dr. Watson
Stewart Robbins
as Benjamin Forman
Hugh Thompson
as Sir Edward Leighton
Ludwig Kreiss
as Baron von Stalburg
Mario Majeroni
as James Larrabee
William Postance
as Sidney Prince
Chester Beery
as Craigin
Fred Malatesta
as 'Lightfoot' McTague
Grace Reals
as Madge Larrabee
