City of Secrets
Review for first four books: It has been a long time since I've read this book, but I remember I really enjoyed reading them back in the day. It was an original idea and fun to read. If you haven't I'd recommend you try it. But I do remember that by the time I was around the fourth book I thought it was getting a little too childish (writing style, wording and storywise). So maybe I've outgrown them by now. I've yet to read the last two books, I'm thinking about giving them a try.
