You don't have to be thin to feel small. Donnie's life is unraveling. His parents' marriage is falling apart, and his sister is slowly slipping away in the grip of her illness. To top it all off, he accidentally starts a rumor at school that hurts someone he cares about and leaves...
When his parents decide to separate, eighth-grader Donnie watches with horror as the physical condition of his 16-year old sister, Karen, deteriorates due to an eating disorder.