Sir Arthur Conan Doyle 
The Valley of Fear (Diversion Classics) [EPUB ebook] 

Featuring an appendix of discussion questions, the Diversion Classics edition is ideal for use in book groups and classrooms.
In the final Sherlock Holmes novel, Holmes and Watson receive a cryptic cipher message that leads them to the site of a murder. What follows is a case of destroyed evidence, a secret society, and a mistaken identity. Introducing Professor Moriarty, one of the most enduring Sherlock Holmes villains, THE VALLEY OF FEAR continues to entertain readers long after its original publication.