Captive Universe
Chimal lives in an Aztec valley, where the serpent-headed goddess, Coatlicue, walks. When Chimal notices that all creatures entering the valley seem to come from the same place, he goes to investigate. Leaving the valley, he discovers that it is contained in a "generation starship", which is run by a group who live lives similar to those of medieval monks.
Chimal first adjusts to life outside the valley, then sets about liberating the inhabitants of the ship.
This is regarded as one of Harrison's most literary novels.
Harry Harrison
Harry Harrison (born Henry Maxwell Dempsey, 1925–2012) was an American science fiction (SF) author, best known for his character the Stainless Steel Rat and for his novel Make Room! Make Room! (1966). The latter was the rough basis for the motion picture Soylent Green (1973). Harrison was (with Brian Aldiss) the co-president of the Birmingham Science Fiction Group.
Aldiss called him "a constant peer and great family friend". His friend Michael Carroll said, "Imagine Pirates of the Caribbean or Raiders of the Lost Ark, and picture them as science-fiction novels. They're rip-roaring adventures, but they're stories with a lot of heart."