The Hound of the Baskervilles summery

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… be Jack's harried wife and not his sister, is discovered tied up in his house, having refused to participate in his dastardly scheme. Back in London, Holmes ties up the loose ends, announcing that the stolen shoe was used to give the hound Henry's scent, and that mysterious warning note came from Beryl Stapleton, whose philandering husband had denied their marriage so as to seduce and use Laura Lyons. Watson files the case closed.