I really enjoyed this book. It's a solid space adventure with some nice plot twists and good reveals. I was worried at the beginning - particularly during the scenes on Ceres - that this was going to be an example of a story that just uses an SF setting but isn't necessarily SF. However things really kicked into full-fledged SF mode once the initial worldbuilding of the political situation of Earth/ Mars/ Belt was rounded out, and it never looked back after that. My only other (early) worry was that the character of Holden was just too damn 'goody-good' to be true. Luckily the other characters are more grounded and cynical and call Holden on his wide-eyed worldview. It's not as cutting-edge science fictionally as, say, Paul Macauley's Quiet War series or Charles Stross's work, but it's certainly got some interesting ideas and goes quite some way to creating a believable solar-system-spanning society that's just a century or so ahead of us. I'm looking forward to reading more and seeing what the mooted TV series makes of it all.