As a grown-up, I've read the entire series and I can't praise it enough. If you start it and are not pulled in by the time Nita meets Kit, then put it down and try again next year. I just started my son on book one. We are listening to it together and I gave him the option to stop if it is not interesting to him because he can be a bit picky . He gave it a thumbs up. I am enjoying this second time around
While the content is appropriate for 9+, this is not an easy read!! More realistic age range is 12+, even for advanced readers. I had trouble (had to re-read a few times) reading this when I was 13, and I have always devoured books!