Ring

I adored this. It brought the whole series so far together in a wonderful way, trying up pretty much every loose thread left by Raft, Timelike Infinity, and Ring. I freely admit that I didn't massively enjoy Flux, and was worried that I'd consider the end of the Xeelee omnibus not worth pushing through it, but it really was. Every down of the series so far was made worth it to see the end of the epic.