<p>Sir Arthur Conan Doyle's second novel starring the great detective Sherlock Holmes, <i>The Sign of the Four</i> weaves together a complex plot involving stolen treasure, a secret pact between guards and prisoners, and the Indian Rebellion of 1857. Revealing and humanizing Holmes beyond his portrayal in <i>A Study in Scarlet</i>, this novel from 1890 shows us the detective's drug habits and introduces Watson's wife-to-be, Mary Morstan.

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