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.
| ISBN: | 9781787246232 |
| Publication date: | 5th July 2018 |
| Author: | Arthur Conan Doyle |
| Publisher: | Distributed By PublishDrive |
| Format: | Ebook (Epub) |