by Arthur Conan Doyle (Author)
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.
Number of Pages: 162
Dimensions: 0.37 x 8 x 5.25 IN
Publication Date: July 12, 2018