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The Valley of Fear
Sir Arthur Conan Doyle
A cipher message arrives from Fred Porlock, a pseudonymous 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.
| Media | Books Paperback Book (Book with soft cover and glued back) |
| Released | July 12, 2018 |
| ISBN13 | 9781787246317 |
| Publishers | Adelphi Press |
| Pages | 162 |
| Dimensions | 133 × 203 × 9 mm · 190 g |
| Language | English |
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