New characters, bigger troubles and one really big surprise propel this series forward in Book 3. Young readers undoubtedly love the books for the humor and adventure inside but they likely also appreciate the power of friendship on display as Hilo, D.J., and Gina work together to overcome a host of problems. It's easy to see why this series is so popular. (And I have to credit my son with good taste in books.) I'm looking forward to Book 4.