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