After her sister dies under mysterious circumstances, a young heiress seeks Holmes' help when she feels threatened by her brutish stepfather.
Raymond Massey
as Sherlock Holmes
Lyn Harding
as Dr. Grimesby Rylott
Angela Baddeley
as Helen Stonor
Athole Stewart
as Dr. John Watson
Nancy Price
as Mrs Staunton
Marie Ault
as Mrs. Hudson (uncredited)