- Bertram Millhauserscreenplay
- Arthur Conan Doylestory (as Sir Arthur Conan Doyle)
Rest of cast listed alphabetically
- Jimmy Aubrey(uncredited)
- Mary Bayless(uncredited)
- Brandon Beach(uncredited)
- Frank Benson(uncredited)
- Lydia Bilbrook(uncredited)
- John Burton(uncredited)
- James Carlisle(uncredited)
- Harry Cording(uncredited)
- Jack Deery(uncredited)
- Herschel Graham(uncredited)
- Teddy Infuhr(uncredited)
- George Kirby(uncredited)
- Ethelreda Leopold(uncredited)
- Stanley Logan(uncredited)
- Wilbur Mack(uncredited)
- Maurice Marks(uncredited)
- John C. McCallum(uncredited)
- Robert Milasch(uncredited)
- Belle Mitchell(uncredited)
- Edmund Mortimer(uncredited)
- William H. O'Brien(uncredited)
- John Roche(uncredited)
- Angelo Rossitto(uncredited)
- Gene Roth(uncredited)
- Arthur Stenning(uncredited)
- Hans J. Saltercomposer (uncredited)
- Charles Van Engerdirector of photography
- Russell A. Gausmanset decorator (as R.A. Gausman)
- Edward R. Robinsonset decorator (as Edward Ray Robinson)
- Ellis Burmanprop: stabbed spider (uncredited)
- Bernard B. Brownsound director
- Eugene Joseffcostume jeweller (uncredited)
- Hans J. Saltermusical director (as H.J. Salter)
- Frank Skinnercomposer: stock music (uncredited)
Crew believed to be complete
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