'The Valley of Fear' is the last novel by Arthur Conan Doyle where the reader meets Sherlock Holmes, the famous detective. He and Doctor Watson arrive to a country manor to investigate a possible murder. After receiving a coded message, Holmes links the murder to the name in the message. Clue by clue, our friends get closer to Holmes’ arch enemy Professor Moriarty. It is a brilliantly executed mystery, riddled with sufficient evidence and compelling, plot-driven structure. Detective fiction enthusiasts will not be disappointed.Sir Arthur Conan Doyle (1859-1930) was born in Scotland and studied medicine at the University of Edinburgh. After his studies, he worked as a ship’s surgeon on various boats. During the Second Boer War, he was an army doctor in South Africa. When he came back to the United Kingdom, he opened his own practice and started writing crime books. He is best known for his thrilling stories about the adventures of Sherlock Holmes. He published four novels and more than 50 short-stories starring the detective and Dr Watson, and they play an important role in the history of crime fiction. Other than the Sherlock Holmes series, Doyle wrote around thirty more books, in genres such as science-fiction, fantasy, historical novels, but also poetry, plays, and non-fiction.