This is a sweet little tale - but you have to be able to accept that:
1. a two-and-a-half-thousand year old immortal still hasn't come to terms with her disability, and,
2. the other immortals around her haven't come to terms with it either - for example, "Most people preferred to pretend it didn't exist [...] What was the point in causing those around her discomfort?", and, "Nor did she blame her mother - who found it difficult to look at the child she'd borne..."
Well sheesh - get over it all of you. Two and a half thousand years to sort their feeling out and they STILL haven't???
So, you have to get through that. But once you do, this is a fairly straightforward love story that allows itself time to develop. These two are totally different - she's ancient, well-read, vastly knowledgeable, well respected and emotionally damaged by her disability. He's a big, tough fighter who had a loveless upbringing and is rather sweetly insecure about some things. He even admits to not being able to read that well. You get a real sense of them both learning about the other, and while there's the usual mind blowing sex, it comes quite late in the relationship. There's also a some angel politics, and some insight into how Raphael's Seven (is it seven?) bonded and came together.
I think it's set before any of the other novels or novellas in this series, and it's here that Illium gets the Bluebell nickname that haunts him in the later books. It's nice to see all the old favourites through another's eyes, and has a lovely ending. SO this is a nice story, well written and engrossing. How much you'd enjoy it without first reading some of the Angel novels I can't say - I've been with this series from the very beginning - but I enjoyed it, have read it a couple of times, and will read it again