Found this book via Boing Boing and ordered it along with several others for reading over Christmas in Colorado. With the power outage, I had the chance to get through it last week.
All in all it’s a pretty good read. The idea of an “inside out” world where the Sun(s) and the people live inside the world; a bubble, is intriguing. The author does a nice job of unfolding how it all works throughout the book. A few weak spots (all too coincidental relationship between Hayden and Spinner and the ending which I found, frankly, weak). But a worthwhile read if you are looking for something new.