My son (8) and I read this book together. It was so such fun! Every chapter has a puzzle to solve along with an interactive illustration. Such an engaging book. My son immediately asked if there was a second book in the series when we finished it. To top it off, there is an extension activity where you can crack a code from numbers you’ve been collecting in each chapter on the website! I won’t give away what you get- but my son was thrilled 😁. Highly recommend. One of our favorite books of all time.