Holmes, retired to Sussex, is drawn into a last case when his arch enemy Moriarty arranges with an American gang to kill one John Douglas, a country gentleman with a mysterious past. Holmes' methods baffle Watson and Lestrade, but his results astonish them. In a long flashback, the victim's wife tells the story of the sinister Vermissa Valley.

Arthur Wontner
as Sherlock Holmes

Lyn Harding
as Prof. Moriarty

Leslie Perrins
as John Douglas

Ian Fleming
as Dr. John Watson

Charles Mortimer
as Insp. Lestrade

Minnie Rayner
as Mrs. Hudson

Michael Shepley
as Cecil Barker

Jane Carr
as Ettie Douglas

Ben Welden
as Ted Balding

Roy Emerton
as Boss McGinty
CinemaSerf
Another efficient outing for Arthur Wontner and Ian Fleming as "Holmes" and "Watson" sees the renowned detective teased from retirement to investigate the mysterious, and rather brutal, death of a country gent at the hands of an American gang ("The Scowlers"). To start with, no-one is quite sure why...