Sherlock Holmes receives a cipher message from Fred Porlock, an agent of Professor Moriarty. However, Porlock changes his mind for fear of Moriartys discovering that he is a traitor and 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 bookcipher. Holmes is able to decipher the message as a warning that "some devilry is intended against one Douglas", a country gentleman residing at Birlstone House. Some minutes later, Inspector Macdonald arrives at Baker Street with news that a Mr. John Douglas of Birlstone Manor House has been murdered. Holmes, Watson, and MacDonald travel to Birlstone House, an ancient moated manor house, to investigate the crime.

Binding: Paperback;108 pages; Publisher: Chicago Review Press Inc DBA Indepe; Classification: ; Weight: 421 g; Dimensions: 229 x 152 x 25

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