Absolutely fantastic - my favourite Sawyer work to date. Read a scan with only a few problems, there's also a Canadian Blind organisation's audio version available, I believe.
Can be a little heavy on genetics, but I like that sort of thing and it's a truly heartrending story. Read whilst feeling fairly low and although it almost made me (a grown man, I must point out_ cry, also made me remember the purposes we can put life to.