Jessica Priest is subjected to painful testing as the incestuous twins, Liz Arno and Kevin Bergregor, attempt to turn her into an experimental feral. When Priest escapes with their prized Heat-16 module, her former comrades are sent after her where they destroy the occupants of the nearby town of El Morte. Priest is captured by the guards of Erlich Westerlin, who recover the Heat-16 module and forces her into a life as a Uranium-235 miner.