Book 9: Aurora. I pretty much know what I am getting into with KSR novels. This one was about a massive generation ship and the issues they face seven generations in when it turns out the planetary system they are aiming for isn't what they'd hoped.
It's basically three novels in one and, to my read, they don't cohere great and the one in the middle is mostly a stream-of-consciousness from an AI which I could have done without. Odd ending but still good reading.