Writer
Derek Blomfield
WRITER
Arthur Conan Doyle
Stars (in credits order)
Carl Bernard
Professor Wilson
Gladys Boot
Mrs. Marden
George Desmond
Professor Pratt-Haldane
Sheila Shand Gibbs
Miss Agatha Marden
Peter Neil
Charles Sadler
Andrew Osborn
Professor Austin Gilroy
Henry Oscar
The Storyteller
Victor Platt
Murray
Ellen Pollock
Miss Helen Penelosa
Anne West
The maid
