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The Valley of Fear is the final Sherlock Holmes novel by Sir Arthur Conan Doyle. The story was first published in the Strand Magazine between September 1914 and May 1915. The first book edition was published in New York on February 27, 1915.

The plot of the novel is based very loosely on the real-life activities of the Molly Maguires and, particularly, of Pinkerton agent James McParland.
The novel is divided into two parts: in the first, Holmes investigates an apparent murder and discovers that the body belongs to another man; and in the second, the story of the man originally thought to have been the victim is told.