I love Knowing Jack so much, and I was hooked right away in the first chapter. I thought that this book was written perfectly. This is a great adventure book to read for fun. But this book has some really big words in it, so if you're going to read it, I suggest that you are at least 13-15 years old. It also had some violence in it, so be aware. If I had the chance to go into the world of Jack I would definitely go.