Classics, modern fiction, nonfiction, and more. The Oxford Bookworms Library is designed for secondary school students and adults and offers seven reading levels, from A1-C1 according to the CEFR. Sherlock Holmes is the greatest detective of all time. As he sits in his room with his pipe, he listens, watches, and thinks. He hears the steps coming upstairs; he sees the door open—and knows what question the stranger will ask. In these three of his best stories, Holmes receives three visitors to the famous Baker Street apartment—visitors who bring their problems to the only man in the world who can help them. CEFR A2/B1. Intertaal is your reliable supplier, guaranteeing fast delivery.