?? A cryptic message. A missing father. A pact sealed in blood. In The Sign of the Four, Sherlock Holmes faces a case like no other—a mystery that stretches from the foggy streets of London to the far corners of the British Empire. When Mary Morstan receives a series of strange pearls and a summons from an anonymous benefactor, she turns to Holmes and Dr. Watson for help. What unfolds is a dazzling investigation involving stolen treasure, a secret alliance, and a chilling tale of vengeance from colonial India. As Holmes navigates riddles, poison darts, and a deadly pursuit along the Thames, Watson finds himself falling for Mary—a romance that will change his life forever. ?? Why this novel is a classic: Introduces Toby the tracking dog and Holmes' famous violin playing Features one of Doyle's most complex plots and fast-paced action Mixes detective work with adventure, romance, and imperial history Marks the beginning of Watson's romantic arc ?? Perfect for readers who love: Sherlock Holmes novels and classic mysteries Exotic settings and hidden treasure plots British detective fiction with historical flair Holmes & Watson's early adventures ?? What readers are saying: "Doyle combines mystery and adventure like no other—this is Holmes in full force." – Classic Crime Review "A thrilling blend of treasure, betrayal, and clever deduction." – Amazon Reviewer ?? Click "Buy Now" and follow Holmes through one of his most dangerous—and dazzling—adventures yet.