Adaptation of the Conan Doyle story The Mazarin Stone.
Eille Norwood
Sherlock Holmes
Hubert Willis
Dr. John Watson
Tom Beaumont
Insp. Gregory
Lionel d'Aragon
Count Sylvinus
Laurie Leslie
Merton
George Ridgwell
Director
Arthur Conan Doyle
Story
Geoffrey Malins
Writer
P.L. Mannock