Gemma Fae Cross, a tough-girl amateur boxer whose fiancé is running for congress, has just made a startling discovery about herself. She is half faerie – and not just any faerie, but a tooth faerie.

A hybrid of fae and human, Gemma is destined to defend the Olde Way and protect the fae – who are incapable of committing violence – from threats to their peaceful and idyllic way of life, which must be maintained by distilling innocence collected from children's baby teeth.

But when a threat to the fae mission emerges, Gemma is called upon to protect her heritage, and become a legendary fae warrior... even if it means sacrificing everything she knows about being human.