In a world of robots, Guardian android caregivers, and sanctioned reproduction, where the vibrations of war hum in the background and nature waits silently to exact cataclysmic revenge, Ethan Caldwell, far removed from all the brutality, lives a brilliant and safe life in a bubble of abundance and privilege.On A transformative night for all humankind, Seren Ethan's daughter vanishes in the chaos, and Echo, the elegant android entrusted with her care, falls into a rare state of grief, awakening questions about her sentience.