We return to the world of Severian, now the Autarch of Urth, as he leaves the planet on one of the huge spaceships of the alien Hierodules to travel across time and space to face his greatest test, to become the legendary New Sun or die.

The strange, rich, original spaceship scenes give way to travels in time, wherein Severian revisits times and places which fill in parts of the background of the four-volume work, that will thrill and intrigue particularly all readers of the earlier books. But The Urth of the New Sun is an independent structure all of a piece, an integral masterpiece to shelve beside the classics, one itself.