Meg Rosoff's New Working Title.
(via Bookninja)
Also see the not your mother's bookclub interview:
You've taken some heat for the central relationship in How I Live Now. If you knew then what you know now about people's responses, would you have changed anything?
I might not have made Edmond and Daisy first cousins if I'd known how freaked out people were going to be about it, but I don't see anything wrong with it. It's not illegal in most places, and then only because of the genetic considerations. I come from a long line of eastern European Jews, and there was a huge amount of marriage within families. It has caused genetic problems over time, but I'd hardly consider it immoral. My personal feeling is (and I think it comes out in my work) that morality has to do with treating other people with respect and care, not necessarily following the rules that society sets. Real love is something to be treasured in almost any form.