The Eyre Affair, written by Jasper Fforde, is an alternative history mystery novel set in a world where literature is taken very seriously. The story follows Thursday Next, a literary detective, as she investigates a series of crimes involving stolen manuscripts and characters escaping from books. Fforde's imaginative world-building, witty writing style, and literary references make The Eyre Affair a delightful read for fans of alternative history and mystery genres, as it combines elements of fantasy, detective fiction, and literary analysis.