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Mycroft investigates when the Mazarin Stone is stolen from a museum, and Watson deals with the promise of a large inheritance if a third person with the surname of Garrideb can be found.
Mrs. Hudson asks Holmes to help her friend with a lodger who insists on nobody entering his room, and his secret past is uncovered.
Susan Cushing asks Holmes' help in solving the disappearance of her sister Mary Browner, but it doesn't seem Holmes' type of case until he is told of a Christmas present's grisly contents.