Arthur Wontner

as Sherlock Holmes

Jane Welsh

as Lady Violet Lamsden

Miles Mander

as Claude Holford

Francis L. Sullivan

as Baron von Guntermann

Ian Fleming

as Dr. John Watson

Dino Galvani

as Carlo Ravelli

Philip Hewland

as Insp. Lestrade

Minnie Rayner

as Mrs. Hudson

Anthony Holles

as Marquess de Chaminade