Years ago I read a book that I think I enjoyed but I can't for the life of me remember what it's called. The scene near (or at) the beginning is a young girl in a trench coat on the street at night. She is propositioned by a man. She claims to be new at this and lets him lowball the price. Then I want to say she kills him? I think she had wings under the jacket. Ringing any bells? Thanks!