It's tough for eleven-year-old Ned—or Jelly Belly, as he’s known at school—to stop eating. At four feet eight inches tall, he weighs 109 pounds, and he keeps growing—wider! When his parents send him to a sleepaway diet camp, he and his bunkmates can't quite give up their old habits. Nightly "cheating" adventures keep the boys plump, betraying their secret trips. When Ned finally realizes there’s only one way to lose weight for good, his whole family is glad to help—except Grandma. Grandma loves to cook for Ned and is hurt when he rejects her treats. Can he resist temptation without hurting his grandma and himself?