In 2019 a nuclear explosion flash melted Antarctica and submerged the world. Now it’s 2074 and sixteen-year-old Rosie Columbia lives with other survivors, clinging to life above the floodwaters on the top floors of Seattle’s skyscrapers. Rosie knows the secret work she does for her father, the president of The United Towers, is crucial. She travels back in time to steal tetanus boosters, vitamins, and other supplies that keep humanity going.But when her stepmother pushes her down a flooded elevator shaft, Rosie’s only escape is to the past—without the time-travel chemicals she needs to return home. When she pops into existence in 2018, half-drowned and confused, a street-smart guy named Carlos takes her under his wing.Rosie can run, but she can’t hide. The Collapse is coming, and if she doesn’t figure out a way to return to her own time she’ll die. But first, she has to remember who she is and what she’s fighting for.

    Genetic manipulation and artificial intelligence shape an astounding destiny for our species. With these wondrous changes come unexpected new truths of heart and mind that challenge the very definition of human—and that threaten not only our existence but the universe itself as our surprising powers—both miraculous and monstrous—evolve through the centuries.