Sophie Foster is back in the Lost Cities–but the Lost Cities have changed. The threat of war hangs heavy over her glittering world, and the Neverseen are wreaking havoc. The lines between friend and enemy have blurred, and Sophie is unsure whom to trust. But when she’s warned that the people she loves most will be the next victims, she knows she has to act. A mysterious symbol could be the key–if only she knew how to translate it. And each new clue reveals how far the villains’ dark schemes spread. The Black Swan aren’t the only ones who have plans. The Neverseen have their own Initiative, and if Sophie doesn’t stop it, they might finally have the ultimate means to control her. In this heart-wrenching fifth book in the New York Times and USA Today bestselling KEEPER OF THE LOST CITIES series, loyalties are pushed to the limit as the villains twist the game into something Sophie might not have the talent to win.