Chasm City by Alastair Reynolds? Yeah, I've read it and it's good fun. Really, I think Reynolds' Revelation Space is a bit better, but they both have the ingeniously imagined universe, raw wit and story arch that moves on two different timelines. It's scifi, so don't expect amazingly well-crafted characters andstoryline, but the twist took me by suprise and I was suprised to feel something like missing the characters when I finished the book and went to read something else, so it's not all bad. Although Reynolds focused more on creating an interestingly twisted world.
Go and read it.