Captive Universe
Author: Harry Harrison
 
The valley was isolated in time and space, a land of barbarous science and human sacrifice.
Coatlicue the Dreadful stalked the night, her twin serpent heads dealing death to taboo-breakers.
Citlallatonac the First Priest sacrificed anyone believed to be possessed by the Gods.
Chimal rebelled: he wanted to escape the atavistic confines of his lost civilisation, to venture into the unknown world beyond the valley, a world of hope . . . and nightmare, too.
 
SPHERE BOOKS 1972 EDITION