This book by Tony Abbot is a good read for ages 8-13. I found this book enjoyable for me as an action, adventure, and mystery fan because it includes all three. I think you should read the first book so you can understand the history of the story, although the author gives a brief overview at the beginning. It has some rough parts, like in the beginning after the car chase, Becca stabs a "goon" because he had Lily over the edge of a bridge. So if you're interested in a wild adventurous story involving mystery I recommend this book to you.