The story is about someone claiming to have seen an "Angel" in the sky. As it happens, they have seen something, but it's not an angel at all. The story slowly unfolds to reveal that a young woman is a refugee from another world; she is a person of importance and is being sought by others of her kind, as well as being protected by others; these are the "Angels" that people see.
I liked the concept of the story, and there were a number of really quite good sections of writing. However, I was a bit bored by much of the rest, as they seemed to be a too much like many of the US TV High School dramas. I felt that the plot kept drifting without really explaining why and I found myself fast forwarding through many pages. I consider that it could have been improved quite a bit, by cutting back on some of the less relevant material, and then perhaps focussing more on the core story; but perhaps that's just me.
The story ends leaving many things unresolved; well this is meant to be a series of stories, so that could be appropriate, but I didn't really feel that the book would encourage me to seek out any others.