Interesting premiss kept me guessing, but I did find some logic gaps (for me) in some of the story. I don't like it when "good guys" get hurt but that is me. I would not recommend to an immature beliver or seeker. Too mystical for someone not grounded in their faith.
The first couple of chapters of reading I felt it was very visable this was the authors first book. I felt there was no depth to Anna and a few other people when they were introduced in the book. After chapter 2 that was forgiven and forgotton as things heated up. All the way through the book I couldn't wait to find out what was so important that people would give their life for something they hadn't even seen. There was plenty of action to keep me happy and the spiritual battle was great. I highly recommend this book. Even though there was so much going on it was an easy read. 450 pages went very quickly.