Sixteen-year-old Ren is a daredevil mobile racer who will risk everything to survive in the Ward, what remains of a water-logged Manhattan. To save her sister, who is suffering from a deadly illness thought to be caused by years of pollution, Ren accepts a secret mission from the government: to search for a freshwater source in the Ward, with the hope of it leading to a cure.
However, she never expects that her search will lead to dangerous encounters with a passionate young scientist; a web of deceit and lies; and an earth-shattering mystery that’s lurking deep beneath the water’s rippling surface.