In World War II, a British secret agent carrying a vitally important document is kidnapped en route to Washington. The British government calls on Sherlock Holmes to recover it.
Basil Rathbone
as Sherlock Holmes
Nigel Bruce
as Doctor Watson
Marjorie Lord
as Nancy Partridge
Henry Daniell
as William Easter
George Zucco
as Heinrich Hinckel aka Richard Stanley
John Archer
as Naval Lt. Pete Merriam
Gavin Muir
as Mr. Lang, government agent
Edmund MacDonald
as Detective Lt. Grogan
Don Terry
as Howe
Mary Gordon
as Mrs. Hudson
Bradley Page
as Cady
Clarence Muse
as George
