

The struggle of super-minds in the crime of the century!
Having once again avoided criminal conviction, Professor Moriarity develops a murderous plan to “finish off” his last major nemesis, Sherlock Holmes, by making him fail to prevent the perfect crime. Does it involve a family curse, the crown jewels of England, or something else…
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George Zucco
Professor Moriarty

Henry Stephenson
Sir Ronald Ramsgate

E. E. Clive
Inspector Bristol

Arthur Hohl
Henchman Bassick

May Beatty
Mrs. Jameson, Brandon Housekeeper

Peter Willes
Lloyd Brandon

Mary Gordon
Mrs. Hudson

Holmes Herbert
Justice of the Court

George Regas
Henchman Mateo

Mary Forbes
Lady Conyngham
Frank Dawson
Dawes, Moriarty's servant

William Austin
Inquisitive Stranger
Anthony Kemble-Cooper
Tony Conyngham

Leonard Mudie
Barrows - Moriarty's Attorney (uncredited)
Robert Nobel
Foreman of the Jury (uncredited)

Ivan F. Simpson
Gates - Trial Prosecutor (uncredited)
Neil Fitzgerald
Clerk of the Court (uncredited)

Frank Baker
Tompkins (uncredited)

Denis Greene
Denis Green (uncredited)