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 novel starts with Sherlock Holmes receiving a cipher message from Fred Porlock (pseudonym), an agent of Professor Moriarty. After Porlock sends the message, however, he changes his mind for fear of Moriarty's discovering that he is a traitor. He decides not to send the key to the cipher, but he sends Holmes a note telling of this decision. From the cipher message and the second note, Holmes is able to deduce that it is a book-cipher and that the book used for the encryption is a common book, large (with at least 534 pages), printed in two columns per page, and standardized. An almanac fits these conditions exactly. Holmes tries the latest edition of Whitaker's Almanac, which he had only received a few days earlier, and fails; he then tries the previous edition. With this almanac, Holmes is able to successfully decipher the message as a warning that "some devilry is intended against one Douglas," a country gentleman residing at Birlstone House.

Medios de comunicación	Libros Paperback Book (Libro con tapa blanda y lomo encolado)
Publicado	13 de marzo de 2017
ISBN13	9781544685793
Editores	Createspace Independent Publishing Platf
Páginas	152
Dimensiones	152 × 229 × 8 mm · 213 g
Lengua	English

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