This poignant children's book is told from the perspective of a young boy trying to understand his older sister, who has Down syndrome. He overhears adults saying she has a 'hole in her brain' and takes this literally, leading to his own innocent investigation. The story tenderly explores themes of sibling love, acceptance, and empathy, gently introducing young readers to the concept of disability and the importance of seeing the person beyond their condition. It's a beautifully illustrated tale about understanding differences and celebrating the unique bond between family members.