Pre-Owned Warriors: Power of Three Box Set : Volumes 1 to 6

My son wants every book in this series. That's a lot of books, so we'll have to see about that. But his enthusiasm in wanting more shows that these books do what kids' books are supposed to do: Make kids want to read! And that's hard to do these days, so I consider these books to be a good investment. I'm pretty sure I will be getting him at least one more set, and we'll see where it goes from there.