Do Androids Dream of Electric Sheep? by Philip K. Dick
By 2021, the World War has killed millions, driving entire species into extinction and sending mankind off-planet. Those who remain covet any living creature, and for people who can’t afford one, companies have built incredibly realistic simulacrae: horses, birds, cats, sheep. They’ve even built humans.
Emigrées to Mars receive androids so sophisticated it’s impossible to tell them from true men or women. Fearful of the havoc these artificial humans could wreak, the government bans them from Earth, but when androids don’t want to be identified, they just blend in. Rick Deckard is an officially sanctioned bounty hunter whose job is to find rogue androids and retire them, but cornered, androids tend to fight back–with deadly results.