18. What is the name of the young lady whom Mrs. Hudson shows into Holmes' and Watson's sitting room?
From Quiz The Sign of the Four
Answer:
Mary Morstan
Dr. Watson is immediately taken with Miss Morstan. Indeed, he gives a rather rapturous account of her charms. Notwithstanding, she is a sensible young lady, who states her circumstances succinctly. Her father, Captain Morstan of the 34th Bombay Infantry, who was one of the officers in charge of the convict guard in the Andaman Islands, disappeared under mysterious circumstances and has not been heard of for nearly ten years. Six years ago, soon after taking a position with Mrs. Cecil Forester, she received an untraceable package containing one beautiful and obviously valuable pearl, and every year the gift has been repeated. Finally, that very morning she received an anonymous letter appointing the time and place of an assignation, telling her she is a wronged woman who shall receive justice and advising her to bring two friends.
Helen Stoner is from "The Adventure of the Speckled Band".
Elsie Patrick appears in "The Adventure of the Dancing Men".
Laura Lyons is a character in "The Hound of the Baskervilles".