It was January 2021, and Rick Deckard had a license to kill. Somewhere among the hordes of humans out there, lurked several rogue androids. Deckard's assignment--find them and then retire them. Trouble was, the androids all looked exactly like humans, and they didn't want to be found!

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 built incredibly realistic simulacra: horses, birds, cats, sheep. They've even built humans. Immigrants to Mars receive androids so sophisticated they are indistinguishable from true men or women. Fearful of the havoc these artificial humans can wreak, the government bans them from Earth. Driven into hiding, unauthorized androids live among human beings, undetected.

Rick Deckard, an officially sanctioned bounty hunter, is commissioned to find rogue androids and retire them. But when cornered, androids fight back--with lethal force.