Holmes and Dr. Watson take on the case of a beautiful woman whose husband has vanished. The investigation proves strange indeed, involving six missing midgets, villainous monks, a Scottish castle, the Loch Ness monster, and covert naval experiments.
Robert Stephens
as Sherlock Holmes
Colin Blakely
as Dr. John Watson
Geneviève Page
as Gabrielle Valadon
Christopher Lee
as Mycroft Holmes
Tamara Toumanova
as Madame Petrova
Clive Revill
as Nikolai Rogozhin
Irene Handl
as Mrs. Hudson
Mollie Maureen
as Queen Victoria
Stanley Holloway
as Gravedigger
Catherine Lacey
as Woman in Wheelchair
Peter Madden
as Von Tirpitz
Michael Balfour
as Cabby
