This was not what I expected. Rather dark and not a little disturbing. You have your angels bringing on the end of the world and then turning on each other as well as the humans. Then there is the whole "agnostic angels" idea, where God only speaks to the head angel (who is now dead, btw), and therefore there is doubt and dissension among the ranks as to what is to be done, who is to lead, etc. It is jolting to see angels blaspheming their supposed Creator. Like I said, dark and disturbing.
Despite all that, it is a well written story, with plenty of action and suspense. The characters are well developed, and there are very few editing errors (thank you!).