"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."
Basil Rathbone
as Sherlock Holmes
Nigel Bruce
as Doctor Watson
Lionel Atwill
as Professor Moriarty
William Post Jr.
as Dr. Franz Tobel
Kaaren Verne
as Charlotte Eberli
Dennis Hoey
as Inspector Lestrade
Holmes Herbert
as Sir Reginald
Mary Gordon
as Mrs. Hudson
Harry Cording
as Jack Brady (uncredited)
Harold De Becker
as Peg Leg (uncredited)
Paul Fix
as Mueller (uncredited)
Henry Victor
as Professor Frederic Hoffner (uncredited)
John Burton
as RAF Officer (uncredited)
Paul Bryar
as Swiss Waiter (uncredited)
Whit Bissell
as London Bobbie (uncredited)
Rudolph Anders
as Braun (uncredited)
Colin Kenny
as Scotland Yard Detective (uncredited)
George Burr Macannan
as Gottfried (uncredited)
Harry Woods
as Kurt (uncredited)
Edward T. Lowe Jr.
Screenplay
Roy William Neill
Director
Scott Darling
Hans J. Salter
Music
Adaptation
Arthur Conan Doyle
Story
Jack Otterson
Art Direction
Richard Hageman
Vera West
Costume Design
Edmund L. Hartmann
Frank Skinner
Original Music Composer
Russell A. Gausman
Set Decoration
Charles Previn
Music Director
Howard Benedict
Associate Producer
Otto Ludwig
Editor
Lester White
Director of Photography