Arthur Conan Doyle 
The Sign of the Four 

The Sign of the Four Arthur Conan Doyle – First published in 1890, The Sign of Four is Sir Arthur Conan Doyle’s second book starring legendary detective Sherlock Holmes. The story is complex, involving a secret between four ex-cons from India and a hidden treasure. More complex than the first Holmes novel, The Sign of Four also introduces the detective’s drug habit and leaves breadcrumbs for the reader that lead toward the final resolution.

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Sir Arthur Ignatius Conan Doyle, DL (22 May 1859 7 July 1930) was a Scottish author most noted for his stories about the detective Sherlock Holmes, which are generally considered a major innovation in the field of crime fiction, and 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. Conan was originally a given name, but Doyle used it as part of his surname in his later years.