Dark schemes unfold... and Sophie's devotion has its limits... in this thrilling fifth book in the Guardians of the Lost Cities series.

Sophie Foster has returned to the Lost Cities... but they have changed. The threat of war looms large over her glittering world, and the Invisibles wreak havoc.

The lines between friend and foe have blurred, and Sophie isn't sure who to trust. But when she's warned that the people she loves most will be the next victims, she knows she must act.

A mysterious symbol could be the key... if only she knew how to translate his. Each new clue seems to plunge her world deeper and deeper into darkness, and the Black Swan aren't the only ones with plans. The Neverseen have created their own Initiative, and unless Sophie stops it, they may finally have the final means to control it.