This is probably the most important novel in the “early Baxter” books of the Xeelee sequence. Michael Poole has opened the universe to mankind with his wormholes. We are introduced to Lieserl, humanity’s sentient probe inside our sun. GUTships ride to the very edge of space and time. One of them carries, ark-like, the seed of humanity. Thousands of subjective years later, it arrives at the Ring, a classic BDO (Big Dumb Object) constructed as an escape hatch from the impending destruction of our universe. Big stuff, and Baxter makes it look easy. The message of hope and the importance of Life expressed here are, I think, Baxter’s greatest hallmarks. A fascinating novel indeed.