The Valley of Fear is believed to have been inspired by the real-life case of the Molly Maguires and Pinkerton agent James McParland. It has been adapted for film, television, and the stage.
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Sir Arthur Conan Doyle was born in Edinburgh, Scotland, in 1859. Before starting his writing career, Doyle attended medical school, where he met the professor who would later inspire his most famous creation, Sherlock Holmes. A Study in Scarlet was Doyle's first novel; he would go on to write more than sixty stories featuring Sherlock Holmes. He died in England in 1930.