All her life, Liesl has heard tales of the beautiful, dangerous Goblin King. They've enraptured her and inspired her musical compositions. Now eighteen, Liesl feels that her childhood dreams are slipping away. And when her sister is taken by the Goblin King, Liesl has no choice but to journey to the Underground to save her. But with time and the old laws working against her, Liesl must discover who she truly is before her fate is sealed.