Book excerpt: Why do Agatha Christie’s novels continue to inspire each generation? The answer is the quality and range of her puzzles: her rich and varied structures of deception. Christie broke the mould of detective fiction and rewrote the implicit rules of the whodunnit. Agatha Christie: Plots, Clues and Misdirections examines Christie’s skills as a whodunnit writer. It analyses her methods in setting her puzzles. It shows how she uses a combination of diverse plots, cunning clues and subtle misdirections. In the sheer variety and profusion of each of these elements Christie is without peer, and her combining genuine puzzles with entertaining narratives has never been surpassed. In this unique analysis of how Christie sets her puzzles, two medical professionals and enthusiastic Christie fans explore the greatest of Christie’s deceptions – the impression that her writing is simple.