Devoting herself to her musical career six months after the events of Wintersong, Liesl struggles with her brother's cold withdrawal and her own inability to forget the austere young man who inspired her efforts.

All her life, nineteen-year-old Liesl has heard tales of the beautiful, mysterious Goblin King. He is the Lord of Mischief, the Ruler Underground, and the muse around which her music is composed. Yet, as Liesl helps shoulder the burden of running her family's inn, her dreams of composition and childish fancies about the Goblin King must be set aside in favor of more practical concerns. But when her sister Kathe is taken by the goblins, Liesl journeys...