3 books · Ages 8–12 · Middle Grade
Erin Hunter's Warriors series follows clans of feral cats through territorial wars, prophecies, and moral dilemmas that are genuinely sophisticated. Seven sub-series, over eighty books, and a fandom that treats the lore with the seriousness of Tolkien scholars. For the child who wants to go deep, there is no bottom.

Start at the beginning: Into the Wild
This is a sequential series — each book builds on the last. Start with book 1.