Obsada:
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Basil Rathbone
Sherlock Holmes
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Nigel Bruce
Dr. John H. Watson
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Hillary Brooke
Lydia Marlowe
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Henry Daniell
Professor Moriarty
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Paul Cavanagh
Sir George Fenwick
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Matthew Boulton
Inspector Gregson of Scotland Yard / Narrator
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Eve Amber
Maude Fenwick
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Frederick Worlock
Dr. Onslow
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Tom Bryson
Corporal Williams
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Sally Shepherd
Crandon, Marlowe's maid
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Mary Gordon
Mrs. Hudson
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Eve Ashley
Background woman
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John Burton
Waring
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Harold De Becker
Shoelace seller
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Leslie Denison
Vincent
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Tony Ellis
Carter
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Kay Harding
Victim
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Alec Harford
Commissioner of the CID
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Ivo Henderson
Constable
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Tommy Hughes
Newsman
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Colin Hunter
Constable
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Olaf Hytten
Norris, Fenwick's butler
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Boyd Irwin
Short-tempered officer closing window
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Coulter Irwin
Corporal Williams of the British Army
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Eric Mayne
Member of Mesmer Club
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William H. O'Brien
Pembrook House waiter
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Violet Seaton
Nurse Mowbray
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Arthur Stenning
Mesmer Club servant
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Percival Vivian
Dr. Simnell
