When I first started reading this book, I thought it was boring. However, I made myself keep reading and it turned out to be a really interesting and educational book. I would recommend it, especially if you are trying to learn more about World War II. I intend to continue reading the series!
I just finished reading this book, and I would definitely suggest it to anyone who is interested in learning more about WWII, or just needs a good book to read. There wasn't much about violence or anything like that, but because it's so long, and contains a lot of description, I would advise it for middle readers.