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.
The title refers to Holmes' emergence from retirement to help the government fight the German threat at the approach of the First World War.
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