The Angel Ultimatum by Alexander Mann
The Angel Ultimatum is a self-published book by Alexander Mann that according to this press release is getting turned into a movie. Here is the description from IMDB
Created by God, the Angels have suffered through a war that has divided them, without explanation, and now look upon a mortal creation, full of flaws and suffering. Then, from a set of scrolls that belonged to the Angels themselves, Elizabeth Lloyd, and her team, discover that the Angels, all of them, are looking for answers, aren’t finding them, and that creation itself could fly apart.