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...