How can you live without your heart?

In the vast palace of the empress lives an orphan girl called Nothing. She slips within the shadows of the Court, unseen except by the Great Demon of the palace and her true friend, Prince Kirin, heir to the throne. When Kirin is kidnapped, only Nothing and the prince's bodyguard suspect that Kirin may have been taken by the Sorceress Who Eats Girls, a powerful woman who has plagued the land for decades. The sorceress has never bothered with boys before, but Nothing has uncovered many secrets in her sixteen years in the palace, including a few about the prince.

As the empress's army searches fruitlessly, Nothing and the bodyguard set out on a rescue mission, through demon-filled rain forests and past crossroads guarded by spirits. Their journey takes them to the gates of the Fifth Mountain, where the sorceress wields her power. There, Nothing discovers that all magic is a bargain, and she may be more powerful than she ever imagined. But the price the Sorceress demands for Kirin may very well cost Nothing her heart.