Mystery Crime Thriller
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.
Directed by
Roy William Neill
Leyland Hodgson
Tour Guide
Basil Rathbone
Sherlock Holmes
Frank Mills
Pub Patron (uncredited)
Lillian Bronson
Minister's Wife (uncredited)
Mary Gordon
Mrs. Hudson
Harry Cording
Hamid
Nigel Bruce
Dr. John H. Watson
Ian Wolfe
Commissioner of Scotland Yard
Cyril Delevanti
Convict at Dartmoor Prison (uncredited)
Patricia Morison
Mrs. Hilda Courtney
William H. O'Brien
Detective at Murder Scene
Holmes Herbert
Ebenezer Crabtree
Frank Baker
Photographer
Marjorie Bennett
Antique Shop Assistant (uncredited)
Frederick Worlock
Colonel Cavanaugh
Charlie Hall
Cab Driver (uncredited)
Carl Harbord
Inspector Hopkins
Olaf Hytten
Alfred - Auction House Bookkeeper (uncredited)
Edmund Breon
Julian 'Stinky' Emery
Sally Shepherd
Patricia Cameron
Evelyn Clifford
Wallace Scott
Joe Cisto
Jack Curtis
Pub Patron (uncredited)
Bobby Hale
Pub Patron (uncredited)
Alexander Pollard
Crabtree's Assistant at Auction (uncredited)

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