All legends begin somewhere, and the two novels here are where one of the world's best-loved legends began. In 'A Study in Scarlet', Sherlock Holmes and Dr Watson first meet and investigate a seemingly impossible mystery that begins with a corpse in a deserted house. In 'The Sign of the Four' the detective faces an even greater challenge: solving both the disappearance of Captain Arthur Morstan and the theft of the Agra treasure in India.