Alastair Reynolds revolutionized the science fiction genre with his critically-acclaimed Revelation Space novels. Now, the award-winning author presents a future of technological wonders—from every era… In a far-distant future, Spearpoint, the last human city, is a vast, atmosphere-piercing spire. Clinging to its skin are the zones: semiautonomous city-states, each of which enjoys a different—and rigidly enforced—level of technology.   Following a botched infiltration mission, enforcement agent Quillon has been living incognito, working as a pathologist in a morgue. But when a near-dead angel drops onto his dissection table, his world is wrenched apart.   For the angel is a winged posthuman from Spearpoint’s Celestial Levels. And with the dying body comes bad news: Quillon must leave his home and travel into the cold and hostile lands beyond Spearpoint’s base. But he can neither imagine how far the journey will take him—nor comprehend how much is at stake…