When I find a good audio book series, I avoid the written version, because I listen while I do long distance walking. Having a series of books to distract from the humdrum is invaluable. So, I have not read books 2-6. I am going to wait impatiently for them to become audio books.
I loved this story of a soldier who must test his faith against not only the marketplace of ideas, but in life or death choices. Some may find the story line preachy, but as person of faith myself, I tolerate a great deal of postmodern preaching in other writing. This is a story of a good man forced to do hard things to protect his family and his freedom.