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.