This novella started off quite well with the concept of a division/unit that protects others from demonic entities. It sort of dwindled a tiny bit off the path from the concept. What I noticed most was how the writer filtered a lot of knowledge and facts about various things into the conversations, perhaps in an attempt to set the tone, however that didn't gel with the storyline of demons and angels. It seemed as if there were two strong storylines competing against each other, the unit and the sibling angels. There were minor formatting issues in my copy, the author is posting a revised version.