I've never actually read any Scalzi, for some reason. On the strength of this, I shall get more. Part police-procedural, part the old scifi trick of "come up with one neat technology and explore the ramifications of it". Haden politics are well-treated in this novel but it doesn't become a polemic either for or against; the inhabitants of the Agora are to a greater or lesser extent happy with their non-physical world, but this is not Ra. Good characterisation, interesting plotline, well-worked-out and very human-feeling world. I'm glad I read a couple of reviews which say to first read Scalzi's prologue, Unlocked, on Tor.com, otherwise I'd have had much less clue what was going on.