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The Valley of Fear is the fourth and final Sherlock Holmes novel by Sir Arthur Conan Doyle. It is loosely based on the Molly Maguires and Pinkerton agent James McParland. The story was first published in the Strand Magazine between September 1914 and May 1915. The first book edition was copyrighted in 1914, and it was first published by George H. Doran Company in New York on 27 February 1915, and illustrated by Arthur I. Keller.[1]
The Valley of Fear begins with Sherlock Holmes, the famous detective, and Dr. Watson, his comrade and roommate at 221B Baker Street, in mid-conversation. Holmes is puzzling over an encrypted message that he received from Porlock, an associate of Holmes’ nemesis, Professor Moriarty. A second message from Porlock, which was supposed to contain the key to the coded message, soon arrives, stating that he (Porlock) is afraid of Moriarty’s wrath and will not reveal the purpose of his correspondence. Holmes soon deciphers the message regardless, and discovers that it warns that Douglas of Birlstone is in imminent danger. The two are soon visited by MacDonald, a policeman friend of Holmes, who informs them that this same Douglas has been murdered.