
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.
Cast

Basil Rathbone
Sherlock Holmes

Nigel Bruce
Dr. John H. Watson

Patricia Morison
Mrs. Hilda Courtney

Frederick Worlock
Colonel Cavanaugh

Harry Cording
Hamid

Carl Harbord
Inspector Hopkins

Holmes Herbert
Ebenezer Crabtree

Edmund Breon
Julian 'Stinky' Emery
Patricia Cameron
Evelyn Clifford

Mary Gordon
Mrs. Hudson

Ian Wolfe
Commissioner of Scotland Yard

Leyland Hodgson
Tour Guide

Marjorie Bennett
Antique Shop Assistant (uncredited)

William H. O'Brien
Detective at Murder Scene

Frank Baker
Photographer

Sally Shepherd
Unknown
Wallace Scott
Joe Cisto
Jack Curtis
Pub Patron (uncredited)

Cyril Delevanti
Convict at Dartmoor Prison (uncredited)

Charlie Hall
Cab Driver (uncredited)

Olaf Hytten
Alfred - Auction House Bookkeeper (uncredited)

Frank Mills
Pub Patron (uncredited)

Lillian Bronson
Minister's Wife (uncredited)
Bobby Hale
Pub Patron (uncredited)
Alexander Pollard
Crabtree's Assistant at Auction (uncredited)
Crew

Roy William Neill
Director, Producer
Frank Gruber
Adaptation
Leonard Lee
Screenplay

Arthur Conan Doyle
Story
Saul A. Goodkind
Editor
Maury Gertsman
Director of Photography
Howard Benedict
Executive Producer
Vera West
Costume Design
Carmen Dirigo
Hairstylist

Jack Pierce
Makeup Department Head
Bernard B. Brown
Sound Director
Milton Rosen
Music Director
Edward R. Robinson
Set Decoration
Russell A. Gausman
Set Decoration
Jack Otterson
Art Direction
Martin Obzina
Art Direction
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