Directed by
| Jack Raymond | ||
Writing Credits
| Arthur Conan Doyle | ... | (story "The Adventure of the Speckled Band") (as Sir Arthur Conan Doyle) |
| W.P. Lipscomb | ... | (adaptation) |
Cast (in credits order)
| Lyn Harding | ... | Dr. Grimesby Rylott | |
| Raymond Massey | ... | Sherlock Holmes | |
| Angela Baddeley | ... | Helen Stonor | |
| Nancy Price | ... | Mrs. Staunton | |
| Athole Stewart | ... | Dr. John Watson | |
| Rest of cast listed alphabetically: | |||
| Marie Ault | ... | Mrs. Hudson (uncredited) | |
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Franklyn Bellamy | ... | Alaine (uncredited) |
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Ivan Brandt | ... | Curtis (uncredited) |
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Stanley Lathbury | ... | Rodgers (uncredited) |
| Moore Marriott | ... | Member of Jury (uncredited) | |
| Joyce Moore | ... | Violet Stonor (uncredited) | |
| Charles Paton | ... | Builder (uncredited) | |
Produced by
| Herbert Wilcox | ... | producer (uncredited) |
Cinematography by
| Freddie Young | ... | (as F.A. Young) (photography) |
Editing by
| Maclean Rogers | ... | (as P.M. Rogers) |
Art Direction by
| Lawrence P. Williams | ... | (as L.P. Williams) |
Second Unit Director or Assistant Director
| James G. Kelly | ... | assistant director (as James Kelly) |
Sound Department
| L.F. Odell | ... | sound recordist |
Additional Crew
| Byron Haskin | ... | technical supervisor |