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"The Sign of Four is the second novel featuring Sherlock Holmes written by Sir Arthur Conan Doyle. The story is set in 1888. It has a complex plot involving service in East India Company, India, the Indian Rebellion of 1857, a stolen treasure, and a secret pact among four convicts and two corrupt prison guards. It presents the detective’s drug habit and humanizes him. It also introduces Doctor Watson’s future wife, Mary Morstan…
The Hound of the Baskervilles is the third of the four crime novels written by Sir Arthur Conan Doyle featuring Sherlock Holmes. It tells the story of an attempted murder inspired by the legend of a fearsome, diabolical hound of supernatural origin. Sherlock Holmes and his companion Doctor Watson investigate the case..."