A convicted thief in Dartmoor prison hides the location of the stolen Bank of England printing plates inside three music boxes. When the innocent purchasers of the boxes start to be murdered, Holmes and Watson investigate.
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Basil Rathbone as Sherlock Holmes
Nigel Bruce as Dr. John H. Watson
Patricia Morison as Mrs. Hilda Courtney
Frederick Worlock as Colonel Cavanaugh
Harry Cording as Hamid
Carl Harbord as Inspector Hopkins
Holmes Herbert as Ebenezer Crabtree
Edmund Breon as Julian 'Stinky' Emery
Patricia Cameron as Evelyn Clifford
Mary Gordon as Mrs. Hudson
Ian Wolfe as Commissioner of Scotland Yard
Leyland Hodgson as Tour Guide
Marjorie Bennett as Antique Shop Assistant (uncredited)
William H. O'Brien as Detective at Murder Scene
Frank Baker as Photographer
Sally Shepherd as
Wallace Scott as Joe Cisto
Jack Curtis as Pub Patron (uncredited)
Cyril Delevanti as Convict at Dartmoor Prison (uncredited)
Charlie Hall as Cab Driver (uncredited)
Olaf Hytten as Alfred - Auction House Bookkeeper (uncredited)
Frank Mills as Pub Patron (uncredited)
Lillian Bronson as Minister's Wife (uncredited)
Bobby Hale as Pub Patron (uncredited)
Alexander Pollard as Crabtree's Assistant at Auction (uncredited)