An Impure world, a perfect murder... A murdered society debutante, her body sprinkled with 89 Costa Rican butterflies. A headless, gutted corpse washed up on shore with a beautiful, dead teenager. The case is anything but straightforward, and in an uncertain future, where resources are limited and the genetically defective are banished to a ghetto territory for Impures, Chief Detective Ina Stone and her partner, rookie detective Sam Fujimoto, must cross into Pure Territory to find a killer. An Impure herself, Ina must overcome her defect. And when her life is threatened, she must learn to rely on Sam, whose interest in her seems more than just professional. Yet the Pures may have created a world in which even they don't want to live anymore. Resources have become too scarce to hide, and a black market for medicine comes to light. When a third murder is discovered, Ina and Sam know there's a connection. With too many suspects and not enough time, they must find that connection before the killer strikes again.