The Sign of the Four first appeared in the February 1890 edition of Lippincott's Monthly Magazine and was published in book form later that year. The second novel featuring the famous detective Sherlock Holmes and his companion, Dr. John Watson, the story is celebrated for its intricate twists and turns and its clever blend of mystery and adventure. The plot centers around the murder investigation of Bartholomew Sholto, a search for a missing treasure, and Dr. Watson's romance with Mary Morstan. The Sign of the Four is a much-beloved classic of the genre that has inspired more than a dozen screen adaptations and remains a perpetual favorite of Sherlock Holmes fans. This meticulous republication of the original edition includes a detailed biographical timeline.