Classics, modern fiction, non-fiction and more. Written for secondary and adult students the Oxford Bookworms Library has seven reading levels from A1-C1 of the CEFR. Listen along with downloadable MP3 audio. Dartmoor. A wild, wet place in the south-west of England. A place where it is easy to get lost, and to fall into the soft green earth which can pull the strongest man down to his death. A man is running for his life. Behind him comes an enormous dog - a dog from his worst dreams, a dog from hell. Between him and a terrible death stands only one person - the greatest detective of all time, Sherlock Holmes.