 City of a Thousand Suns

City of a Thousand Suns is a 1965 science fantasy novel by American writer Samuel R. Delany, the final novel in the "Fall of the Towers" trilogy.As in the other two books, the setting is the post-apocalyptic empire of Toromon, confined by a surrounding "Barrier" of highly-radioactive land, and inhabited by mutant/evolved "forest people" (some of whom are telepaths) and devolved "neanderthals", as well as normal humans.