Eille Norwood
Sherlock Holmes
Hubert Willis
Dr. John Watson
Tom Ronald
Reuben Hayes
Charles Croker-King
Duke of Holdernesse
Irene Rooke
Duchess of Holdernesse
Mme. d'Esterre
Mrs. Hudson
Leslie English
Dr. Thorneycroft Huxtable
Patrick Key
Lord Arthur Saltire
Cecil Kerr
James Wilder