This challenging quiz book, intended for professional-grade Austen readers only, arranges questions, in four ascending levels of difficulty for each novel. Some questions are short, factual and to the point, like “How old is Darcy?” (The answer is 28.) Others require interpretation. Why, for instance, does Wickham elope with Lydia, since he is a mercenary cad and she has no fortune? The authors, John Sutherland and Deirdre Le Faye, need more than a page to answer this one.