Sir Arthur Ignatius Conan Doyle, DL (22 May 1859 – 7 July 1930) was a Scottish physician and writer, most noted for his stories about the detective Sherlock Holmes, which are generally considered a major innovation in the field of crime fiction, and for the adventures of Professor Challenger. He was a prolific writer whose other works include science fiction stories, historical novels, plays and romances, poetry, and non-fiction.
A cypher message and a horrible murder in a Sussex village begin this dark and powerful tale as Holmes battles with the forces of the criminal mastermind, Professor Moriarty. Central to the novel lies the story of a terrorist brotherhood and the hold it acquires over an American mining valley.
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