I have a fuller review up at my site; here I will say that I was not keen on Axis most of the way through, which disappointed me on account of how much I really liked Spin, its predecessor. You don't care about the characters in Axis the way you do in Spin until very late, but once you do, the book's promise is, I think, fulfilled. Appropriately one star less than Spin, but all said and done, a very worthy sequel.