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A gripping, easy to read edition, rewritten in accessible clear, modern English Dr. Watson is asked by a female friend of his wife to find her missing husband who is an opium addict. Dr. Watson tracks him down to an opium den, where, to his great surprise he also finds that Sherlock  Holmes and the police are investigating the disappearance of a Boone that they believe has murdered Mr. St. Clair. However, several days later Mr. St. Clair's wife receives a letter from her husband that forces Sherlock and the police to reconsider the case.