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Raymond Massey as Sherlock Holmes |
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Lyn Harding as Dr. Grimesby Rylott |
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Angela Baddeley as Helen Stonor |
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Athole Stewart as Dr. John Watson |
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Nancy Price as Mrs Staunton |
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Marie Ault as Mrs. Hudson (uncredited) |
| Directing | Jack Raymond | Director |
| Art | Lawrence P. Williams | Art Direction |
| Sound | L.F. Odell | Sound Recordist |
| Production | Herbert Wilcox | Producer |
| Writing | Arthur Conan Doyle | Story |
| Writing | W.P. Lipscomb | Adaptation |
| Camera | Freddie Young | Director of Photography |
| Editing | Maclean Rogers | Editor |
