I got these books on a friend recommendation. I feel like I've learned more than the kids sometimes! The books are very informative and lead you back to the original writings of the principles if you are really interesting in diving in.
I feel like the books themselves are a little long. But the kids seem to be engaged the entire time. They are capable of understanding much more than we think sometimes! But I love the author. He is full of wonderful information and a great source for no nonsense politics. Love his book Christ vs. Caesar as well. Highly recommend.