When a bored Sherlock eagerly takes the case of Gabrielle Valladon following an attempt on her life, the search for her missing husband leads to Loch Ness and the legendary monster.
Robert Stephens
Sherlock Holmes
Colin Blakely
Dr. John Watson
Geneviève Page
Gabrielle Valadon
Christopher Lee
Mycroft Holmes
Tamara Toumanova
Madame Petrova
Clive Revill
Nikolai Rogozhin
Irene Handl
Mrs. Hudson
Mollie Maureen
Queen Victoria
