When   Sherlock Holmes receives a bungled tip-off from one of the agents of his   nemesis, Professor Moriarty, the great detective hopes to avoid a murderous   crime and bring the would-be assassin to justice. But on being informed soon   afterwards that one John Douglas of Birlstone Manor has been found with his   head blown apart by a shotgun, he realizes that he is too late. And so begins   an enthralling tale of revenge, vigilantism and secret societies, one that   transports the reader from the English countryside to the violent world of   the American frontier of the 1860s.
     
     The fourth and final novel in the Sherlock Holmes canon, originally   published in the Strand magazine between September 1914 and May 1915, The   Valley of Fear is a riveting whodunit that showcases all of the classic   elements that have ensured the enduring popularity of the stories featuring   Conan Doyle's most famous creation.