A little more than a century from now, our world has been utterly transformed. After years of slowly overtaking the continent, rising floodwaters have obliterated America’s great coastal cities and then its heartland, leaving nothing but an archipelago of mountaintop colonies surrounded by a deep expanse of open water. For seven years, Myra has grieved the loss of her oldest daughter, Row, who was stolen by her father after a monstrous deluge overtook their home in Nebraska. Then, in a violent confrontation with a stranger, Myra suddenly discovers that Row was last seen in a far-off encampment near the Arctic Circle. She and her younger daughter, Pearl, embark on a perilous voyage into the icy northern seas, hoping against hope that Row will still be there.