Selling Out by Justina Robson.  

This second entry in Robson's Quantum Gravity series is less a discrete unit than the first, but no less fun. After the events of Keeping It Real, cyberheroine Lila Black journeys to Demonia, a land where Hell is ever-present, and excess has been elevated to high art. Robson introduces several new characters, and gives a bit of insight into Zal's transformation as he undergoes his own dark odyssey. My only complaint is that the book, like many second series novels, doesn't stand alone as a complete story. It's no great pain to read the first, but when something like this ends so abruptly, I can only hope the next book is quickly forthcoming.