… the individual man is an insoluble puzzle …’Miss Mary Morstan receives a strange letter, telling her to meet an unknown benefactor to discover the truth about her missing father. With Sherlock Holmes and Dr Watson on the case, the ensuing events spark an investigation that reveals a dreadful secret. Following the story of four men and stolen Agra treasure, Holmes is led on a journey that brings him to a wooden-legged man, determined to seek revenge.