In the distant future, enforcement agent Quillion is living incognito in the last human city of Spearpoint, working in the district morgue. But when a near-dead angel drops onto his dissecting table, his world is wrenched apart. For the angel is a winged posthuman from Spearpoint's Celestial Levels. And to save the angel's life, Quillion must leave his home and travel into the cold and hostile lands beyond the city.