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Listen to the full, unabridged mystery audiobook of "The Sign of the Four" by Sir Arthur Conan Doyle, proudly presented by Audiodidact. In this historic second Sherlock Holmes novel, the brilliant detective and Dr. John Watson are drawn into a complex web of stolen treasure, secret pacts, and a bizarre murder at a secluded London estate. The case introduces Mary Morstan, a young woman receiving mysterious pearls every year, and features a thrilling boat chase down the River Thames. Explore themes of greed, imperial secrets, and the famous introduction of Holmes's analytical genius. Perfect for mystery lovers, detective fiction fans, and students. Subscribe to Audiodidact for more full classic audiobooks.