England, at the start of World War Two. Mysterious wireless broadcasts, apparently from Nazi Germany are heard over the BBC. They warn of acts of terror in England, just before they take place. Baffled, the Defense Committee call in Sherlock Holmes.
Sherlock Holmes
Doctor Watson
Kitty
Sir Evan Barham
R.F. Meade
Sir Anthony Lloyd
General Jerome Lawford
Admiral Sir John Fabian Prentiss
Captain Roland Shore
Mrs. Hudson
Jill Grandis
Camberwell
Smithson - Barham's Butler (uncredited)
Meade's Henchman (uncredited)
BBC Radio Announcer (voice) (uncredited)
Voice of Terror (voice) (uncredited)
Bar Patron (uncredited)
