The Return of Sherlock Holmes #6 by Sir Arthur Conan Doyle

A mysterious correspondent, who sends a large pearl to Miss Mary Morstan once a year, requests a meeting with her. Holmes and Watson take the case, which involves a terrible death and vanishing treasure. There is an epic pursuit through the dawn streets and later along the River Thames. The cast of characters includes the unfortunate Sholto twins, the mongrel Toby, and the wooden-legged man, as the fire and blood of mutiny-torn India throw gigantic, distorted silhouettes across late Victorian London.