In a future world destroyed by earthquakes, a boy named Spaz lives in the violent Urb. He has epilepsy, which prevents him from using 'mindprobes'—devices that let people experience artificial realities. When he learns his foster sister Bean is dying, Spaz embarks on a dangerous journey with an old man named Ryter to find her. Their adventure takes them through different zones of this broken world, challenging everything they know about memory, truth, and what makes us human.