Gone Girl is a gripping urban mystery fiction book written by Gillian Flynn. The story revolves around the disappearance of Amy Dunne on her fifth wedding anniversary. As the investigation unfolds, the reader is taken on a thrilling journey filled with twists and turns. Flynn's writing style keeps the readers on the edge of their seats, making it difficult to put the book down. With its complex characters and unpredictable plot, Gone Girl has become a favorite among fans of urban mystery fiction.