Great conclusion to a very well done trilogy. There's a bit of a rush and inconsistent planning to explain some of back story elements, but in the end it falls together nicely. Jemison's afterword brings some clarity to some of her character development, and is worth the few minutes it takes read. I'm definitely rooting for this to take a Hugo as well, and have added Jemison to my short list of authors who's books I buy automatically.