Manhattan, 2083. Sixteen-year-old Hannah knows that this is the real world. There is no doubt about that. But in this world, the world has taken to the skies. And, out of oil, the climate destroyed, famine, poverty and disease are widespread. History is erased, hierarchies and barriers are broken down and souls cross ages like clouds cross the sky; if something can be imagined, it is possible. But challenges swiftly mount. When Hannah saves a child called Deeby from the sewers, Hannah sets in motion a series of events that quickly spin beyond her control. Soon, Hannah and her friends are in danger, with few allies to help her make sense of the true scope of the peril.