This is exactly what middle-grade fiction should be: funny, fast, and surprisingly thoughtful. Jennifer L. Holm nails the balance between goofy (a world-famous scientist raiding the fridge and dealing with body odor) and meaningful (what does it mean to live a good life, not just a long one?).
The science fair partnership between Ellie and her grandpa-turned-teen is genuinely sweet without being saccharine, and the stakes feel real even though we're talking about mushroom-based immortality formulas. When Jonas Salk the cat gets sick, the story shifts from theoretical to urgent in a way that'll resonate with any kid who's loved a pet.
It's also a godsend for reluctant readers—short chapters, snappy dialogue, and enough humor to keep pages turning. You don't need to love science to enjoy this, though it might spark some curiosity about biology and ethics. At 4.8 stars on Amazon and glowing reviews from parent-focused sites, this is a safe bet for a wide range of kids. Just maybe read The Fourteenth Goldfish first to get the full experience.






