Sophie Foster has returned to the Lost Cities – but the Lost Cities have changed. The threat of war looms heavily over her dazzling world. And the Unseen are causing chaos wherever they can. The lines between friends and enemies have blurred, and Sophie is not sure exactly whom she can trust. But when she is warned that the next victims will be her most beloved people, she knows she must act. A mysterious symbol might be the key – only she doesn’t know what it means. Each new clue reveals even more dark intrigues. The Black Swan is not the only one with a plan. The Unseen have their own Initiative, and if Sophie can't stop them, they might finally find a way to control her. In this thrilling fifth book of the bestselling series, friendships and ideas are tested, with the villains changing the game into something Sophie may not have the talent to face. More than 7 million copies worldwide! The series has been awarded the California Young Reader Medal. The books in the series have repeatedly appeared on the bestseller list of the New York Times, USA Today, Publishers Weekly, and Wall Street Journal. It is set to be adapted for the big screen by Warner Bros with producer Emma Watts. A delightful and dangerous adventure with complex characters and relationships that will stay with you. Lisa McMann, author