Lark thought returning home to face her city was the hardest thing she'd ever do. She was wrong. No longer the girl who ran for her life, Lark's ready for the Institute. She never dreamed she'd find a rebellion, a Renewable, and those she used to love embroiled in the fight of their lives. She's mastered her magic, but she still doesn't know if she can master the darkness stirring inside her. Nothing is simple anymore, and finding her place in this war—and discovering the terrible secrets behind her ruined world—might cost her everything she has left.