"The Last Child" is a novel by John Hart that follows the story of a 13-year-old boy named Johnny Merrimon. Set in a small town in North Carolina, Johnny is searching for his missing twin sister, Ally, who disappeared a year earlier. As he navigates his grief and the challenges of adolescence, he becomes entangled in a web of secrets and danger. The narrative explores themes of loss, resilience, and the complexities of family relationships. Johnny's journey leads him to confront not only the mystery of his sister's disappearance but also the darker aspects of his community, including crime and betrayal.