In the year 2115, when the Earth is no longer inhabitable, the remainder of humanity lives in Babel, a giant space station. Two pilots, Quentin and Kai, must find the planet Paradise, where only the most promising citizens are allowed to live. On their journey, Quentin and Kai encounter Quentin’s estranged father, who left Babel for Paradise when Quentin was a child, and they discover just how different Paradise is from what they imagined—and how they must change it for the better.