Ary Mossheart has done the impossible: the terrarium is shattered, and her people are free. When the folk of Terra are welcomed in by the fairies of Stiltshore, an abundant treetop village filled with light, food and peace, Ary promises herself that her days of saving people are over. It's time to be normal. Live the life her gran would have wanted; the one she never got back in Terra. But when fairies begin to disappear one by one, it becomes clear that Siltshore is not as safe as it seems. Ary, Owl, and Brair will be pulled down dangerous paths as they try to unravel the strange magics of their new world--and the truth about the one they left behind. To save her new home, Ary will have to step into the role of hero once more. Except this time, if she fails, there will be no new world to escape to.