The Sign of the Four is the second novel featuring Sherlock Holmes. Throughout his life Sir Arthur Conan Doyle wrote four novels and in excess of 50 stories starring the famous fictional detective. This mystery is set in the late 1880s and involves aspects of the Indian Rebellion of 1857, a stolen treasure, and a secret pact amongst four convicts. This novel is also where we see, for the first time, that Holmes is a drug addict when he isn't solving crimes and sobers up while working. The annotations are offered as an aid to the reader with some of the more dated language for this fabulous story. This is truly a classic mystery novel and will be enjoyed for generations to come.