EXTINCTIONA generation ago, the asteroid Ceres was home to a genetically altered race of humans. Though a servant race, they inherited a predisposition to violence--and the government that created them was forced to destroy themhellip;ORNow, the future of humanity depends on Ceres. A group of engineers is sent to make the abandoned asteroid habitable once more, as a place where children can grow up in Earth-normal gravity. But when the engineering crew lands on Ceres, they realize that they are not alone--and not welcomehellip;