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The disappearance of a young woman's father, and a mysterious note years later after the strange regular annual delivery of valuable pearls to her, puts Sherlock Holmes on the case.
Inspector Lastrade reveals to Holmes that someone has been breaking into homes for the senseless purpose of destroying small busts of Napoleon.
While convalescing in Cornwall, a depressive Holmes investigates the apparent death from apoplexy of a local woman and the unexplained sudden dementia of her two brothers.