
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.
Kaaren Verne
Charlotte Eberli

Dennis Hoey
Inspector Lestrade

Holmes Herbert
Sir Reginald

Mary Gordon
Mrs. Hudson

Harry Cording
Jack Brady (uncredited)
Harold De Becker
Peg Leg (uncredited)