The Sign of the Four by Arthur Conan Doyle

A mysterious message, a stolen treasure, and a pact made in the heart of colonial India bring Holmes and Watson into one of their most thrilling cases. As they unravel the threads of a decades-old conspiracy, they encounter dark secrets, exotic clues, and a dramatic chase through the foggy streets of London. This adventure also introduces Mary Morstan, whose presence changes Watson’s life. The Sign of the Four blends romance, danger, and deduction in a gripping mystery. It showcases Conan Doyle’s flair for combining action and intellect.