This is exactly the kind of middle-grade fiction that works: a bonkers premise (immortal grandpa becomes teenager) grounded in real emotion (dealing with change, missing people you love, figuring out who you are).
Jennifer L. Holm is a pro—three Newbery Honors for a reason—and she nails the balance between funny and meaningful. The book celebrates science and curiosity without feeling like homework, and the intergenerational relationship is genuinely sweet without being saccharine.
It's safe, smart, and accessible. The only kids who might bounce off are those who need constant action or adventure—this is more character-driven and contemplative. But for kids who like to think about big questions, or who are going through changes themselves, or who just want a funny, warm story about a weird family situation? This absolutely delivers.






