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. Stubbornly independent Myra and her precocious seven-year-old daughter, Pearl, fish from their small boat, the Bird, visiting dry land only to trade for supplies and information in the few remaining outposts of civilization. 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 Artic Circle. Throwing aside her usual caution, Myra and Pearl embark on a perilous voyage into the icy northern seas, hoping against hope that Row will still be there.