All the water in the world: a novel

"In the years after the glaciers melt, Nonie, her older sister and her parents and their researcher friends have stayed behind in an almost deserted New York City, creating a settlement on the roof of the American Museum of Natural History. The rule: Take from the exhibits only in dire need. They hunt and grow their food in Central Park as they work to save the collections of human history and science. When a superstorm breaches the city's flood walls, Nonie and her family must escape north on the Hudson. They carry with them a book that holds their records of the lost collections. Racing on the swollen river towards what may be safety, they encounter communities that have adapted in very different and sometimes frightening ways to the new reality. But they are determined to find a way to make a new world that honors all they've saved"--