Troubled by mysterious visions and missing Thomas terribly, Sasha returns to the dangerous alternate universe Aurora, where she reunites with fellow analogs to explore a shared power that has the potential to save Selene's dying planet.

Susannah Ramos has always loved the water. A swimmer whose early talent made her a world champion, Susannah was poised for greatness in a sport that demands so much of its young. But an inexplicable slowdown has put her dream in jeopardy, and Susannah is fighting to keep her career afloat when two important people enter her life: a new coach with a revolutionary training strategy, and a charming fellow swimmer named Harry Matthews. As Susannah begins...