Dirección: Roy William Neill
En la II Guerra Mundial, un agente secreto británico que lleva consigo un valioso y vital documento es secuestrado de camino a Washington. El gobierno británico llama a Sherlock Holmes para recuperarlo.
Basil Rathbone
Sherlock Holmes
Nigel Bruce
Doctor Watson
Marjorie Lord
Nancy Partridge
Henry Daniell
William Easter
George Zucco
Heinrich Hinckel aka Richard Stanley
John Archer
Naval Lt. Pete Merriam
Gavin Muir
Mr. Lang, government agent
Edmund MacDonald
Detective Lt. Grogan
Don Terry
Howe
Mary Gordon
Mrs. Hudson
Bradley Page
Cady
Clarence Muse
George
Mary Forbes
Mrs. Pettibone
Holmes Herbert
Mr. Ahrens
Thurston Hall
Sen. Henry Babcock
Ian Wolfe
Antiques Store Sales Clerk
John Burton
Army Inspector (uncredited)
Gerald Hamer
Alfred Pettibone
Gilbert Emery
Sir Henry Marchmont (uncredited)
Margaret Seddon
Miss Pringle (uncredited)
