Six months after the end of Wintersong, Liesl is working toward furthering both her brother's and her own musical careers. Although she is determined to look forward and not behind, life in the world above is not as easy as Liesl had hoped. Her younger brother Josef is cold, distant, and withdrawn, while Liesl can't forget the austere young man she left beneath the earth, and the music he inspired in her. Who is the Goblin King? And what is the true meaning of sacrifice when the fate of the world-- and all the ones Liesl loves-- is in her hands?