The Sign of the Four

💎 A hidden treasure. A secret pact. A crime born of greed and revenge. In The Sign of the Four, Sir Arthur Conan Doyle delivers one of Sherlock Holmes's most thrilling and emotional cases — a mystery that tests not only his powers of deduction but also his understanding of the human heart.

When the intelligent and graceful Mary Morstan seeks Holmes's help to unravel the mystery of her missing father and the strange pearls she receives each year, the case spirals into a deadly hunt across London's dark rivers and fog-filled alleys. With Dr. Watson at his side, Holmes uncovers a tale of betrayal, lost treasure, and a sinister brotherhood bound by blood and vengeance.

Full of exotic intrigue, unforgettable twists, and the first spark of romance between Watson and Mary, The Sign of the Four stands as one of the greatest detective adventures ever written — equal parts intellect, danger, and heart.

🕵️ Click "Buy Now" and join The Sign of the Four — a journey through greed, loyalty, and the brilliance of Sherlock Holmes.

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Release date

Ebook: 3 November 2025