Plot: Sherlock Holmes becomes involved in the case of Gabrielle Valladon when the young woman is fished out of the river and brought to 221b Baker Street by a cabbie. She's quite beautiful and doesn't really remember who she is or why she mentioned Holmes' name when found. Using his deductive powers, Holmes determines she is Belgian and having retrieved her luggage from Victoria station, that she had only recently arrived on the boat train. She came to England looking for her husband and has no idea how she ended up in the river. Soon however, the case becomes more complex when Holmes' brother Mycroft warns him to stay away and that it involves the security of realm. Undaunted, Holmes, Watson and Gabrielle follow the trail of clues and are soon in Inverness where they encounter both a troop of missing midgets - a case Holmes had earlier turned down - and have an encounter with the Loch Ness monster. Brother Mycroft also has some unexpected information for his brother.
Alternative Plot: A bored Sherlock Holmes (Robert Stephens) meets Madame Petrova (Tamara Toumanova), a famed ballerina, who tries to seduce him, hoping that their child will have her body and his brains. He manages to extract himself from her grasp, using Dr. Watson (Colin Blakely) as a decoy. Then he and the doctor head for Loch Ness in search of the missing husband of Gabrielle Valladon (Genevieve Page). While there, they meet Sherlock's brother, Mycroft (Christopher Lee), who aids them in solving the mystery.
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