It's 2250. Icecaps have melted. The world is under one unifying government. And humans have a genetic equal: homo transitus. Forced into exile for their differences, transitus families have only one place to live considered safe: the sweltering community of an East Antarctic island. Here, transitus kids train for a life of living in the ocean. Because one day, their lungs will no longer breathe air. For nineteen-year-old Krimsey Enosh, this time has come. When his little sister, Elpida, goes missing, Krimsey has only 24 hours to rescue her before his lungs change. Lamia Karuli, the island's president, also feels time running out-for reasons kept closely guarded. Decades deep in illegal genetic experiments, her actions endanger the very existence of transitus society under her rule-and transitus-kind. Searching for his sister, Krimsey stands against a plot that threatens to destroy life on the island for both humans and transitus. As his transition looms, reality hits. Saving Elpida before his body betrays him may not be possible. Soon, he'll have to take that first shocking breath of ocean... ...and accept what comes next.