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In the midst of World War II, Sherlock Holmes rescues the Swiss inventor of a new bomb-sight from the Gestapo and brings him to England, where he quickly falls into the clutches of the evil Professor Moriarty.
Director
Roy William Neill
Dr. Franz Tobel

Charlotte Eberli

Inspector Lestrade

Sir Reginald

Mrs. Hudson

Jack Brady (uncredited)
Peg Leg (uncredited)

Mueller (uncredited)

Professor Frederic Hoffner (uncredited)