On screen
Cast
22 credited performers
Basil Rathbone
Sherlock Holmes
Nigel Bruce
Dr. John Watson
Hillary Brooke
Lydia Marlowe
Henry Daniell
Professor James Moriarty
Paul Cavanagh
Sir George Fenwick
Matthew Boulton
Inspector Gregson
Eve Amber
Maude Fenwick
Frederick Worlock
Dr. Onslow
Artwork unavailable
Percival Vivian
Dr. Simnell
Coulter Irwin
Corporal Williams
Sally Shepherd
Crandon
Mary Gordon
Mrs. Hudson
Artwork unavailable
John Burton
Waring the Mesmerist (uncredited)
Artwork unavailable
Harold De Becker
Shoelace Vendor Henchman (uncredited)
Artwork unavailable
Tony Ellis
Carter the Hypnotized Subject (uncredited)
Bess Flowers
Bar Patron (seen in mirror) (uncredited)
Kay Harding
4th Victim (uncredited)
Artwork unavailable
Alec Harford
Commissioner of the CID (uncredited)
Olaf Hytten
Fenwick's Butler Norris (uncredited)
Boyd Irwin
Short-Tempered Officer Closing Window (uncredited)
Eric Mayne
Member of Mesmer Club (uncredited)
William H. O'Brien
Pembrook House Waiter (uncredited)