The Kingdom Keepers is a series of books. I have only read three of the books, because the others have not been written yet. They were mysterious, funny, interesting, and fun to read. Although the kids in the story are teenagers, they didn’t seem too much older than me (maybe that’s because I’m nine and they are twelve in the first book). But they are older in the other books. Thirteen, fourteen; one of them fifteen. The story kind of got me ready for some of the stuff in regular life I might experience when I get older. The books were really good.