Allegiances are tested on every side in the third book in Aveyard’s bestselling Red Queen series. Mare Barrow’s journey continues and she's tormented by her lethal mistakes. She's powerless without her lightning, and is a prisoner of Maven Calore, the boy she once loved who is made of lies and betrayal. Now a king, he continues weaving his dead mother’s web in an attempt to maintain control over his country and his prisoner. Meanwhile, Mare’s rebel Reds, no longer able to linger in the shadows, continue to organize, train and expand as they prepare for war. And Cal, the exiled prince with his own claim on Mare's heart, will stop at nothing to bring her back.