Basil Rathbone
Sherlock Holmes
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
Mary Forbes
Mrs. Pettibone
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)
Mary Field
Party Pianist (uncredited)
Colin Kenny
Hotel Doorman (uncredited)
Caroline Frances Cooke
Mrs. Ruxton
