The Sign of the Four (1890)

by Arthur Conan Doyle

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The Sign of the Four by Arthur Conan Doyle is a detective novel written during the late 19th century. It features the iconic character Sherlock Holmes, along with his loyal companion Dr. John Watson, as they are drawn into a complex mystery involving a missing treasure, a disappearance of a father, and a series of puzzling pearls sent to a young woman.