Three hundred years ago, settlements appeared on the surviving parts of the planet—enclosed by domes that were meant to protect the remnants of humanity from new threats. These settlements came to be called sectors. Each one was necessary for the corporation: once even a single sector collapsed, the empire would fall, and the sector residents would learn what lies beyond the domes. It will become known exactly who the invisible walls were built for. Who are they truly protecting—and who are they keeping prisoners?