More of a 3.5 than a 4, but it's Reynolds, so eeh. We don't get enough of this type of sci-fi. The universe still rocks, the tech is interesting (even if a bit mc-guffin-y) and the antagonists are dread-inspiring. I really enjoyed the start and the end of the novel, and was not too enthused about the middle parts. The main issue are the dialogues and characters. It's all a bit stilted and having sociopaths as leads doesn't exactly help.