"Twelve-year-old Caleb is shorter, frailer, and more protected than most kids his age. That's because he has cystic fibrosis, a diagnosis meaning lungs that fill with mucus and a shortened lifespan. Caleb tries not to let his disorder define him, but it can be hard with an overprotective mom and a perfect big brother. Twelve-year-old Caleb is shorter, frailer, and more protected than most kids his age. That's because he has cystic fibrosis, a diagnosis meaning lungs that fill with mucus and a shortened lifespan. Caleb tries not to let his disorder define him, but it can be hard with an overprotective mom and a perfect big brother."--pg. 2 of cover.