The sign of four

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Sherlock Holmes is feeling more than a little jaded and depressed when governess Mary Morstan consults him upon a curious mystery. Since her father disappeared without trace ten years ago, Mary has received annually and anonymously a valuable pearl. When she is finally requested to meet the sender she requires an escort. Holmes and Watson accompany Mary to her encounter with the stranger, who relates to them a tale of secrecy, hidden treasure and sudden death. But before long, there is more than one death to account for, and only Sherlock Holmes has the skill to detect the real villain