This volume includes the complete novels: A Study in Scarlet, The Sign of the Four, The Hound of the Baskervilles and The Valley of Fear. Characterised by reason and an insistence on the powers of deduction, Sherlock Holmes and his trusted friend Dr Watson are perhaps the best-known criminal detectives in literature. With wry comic dialogue coupled with the detail of scientific method, Arthur Conan Doyle has created an unparalleled duo whose adventures continue to enthrall his readers. A Study in Scarlet: the very first published story to feature Sherlock Holmes. The Sign of Four: Holmes' rational mind is called upon to solve the case of the missing Agra treasure in India. The Hound of the Baskervilles: Holmes and Watson find themselves caught up in an age old curse in the Dartmoor countryside, where all is not what it seems. The Valley of Fear: a dark and powerful tale in which Holmes battles with the forces of his nemesis, Professor Moriarty.