Gone Girl, written by Gillian Flynn, is a thrilling urban mystery fiction book that explores the dark side of relationships and the complexities of human nature. The story revolves around Nick Dunne, whose wife Amy goes missing on their fifth wedding anniversary. As the investigation unfolds, secrets and lies are revealed, leading to shocking twists and turns. Set in a suburban neighborhood, the book delves into the psychology of its characters, keeping readers guessing until the very end.