GURPS New Sun explores the world of the Book of the New Sun, the award-winning masterpiece of science fiction by Gene Wolfe. It chronicles the Age of the Autarch and the world a Urth, a place of delicate beauty and savage brutality in a cynosure of technology and magery. Swords and lasers co-exist with clones and concubines, cowboys and Indians, knights and ladies, mechanical men and sailing ships.

Chapters cover history, geography, Nessus, religion, space and time, characters, equipment, thamaturgy, a bestiary, and campaign suggestions.