On the day Luna proves that she is powerful enough to be her father's heir, she is banished for saving the life of an enchanting human boy. Her father, the king, gives her two options: kill Ian and regain her honor by the time she comes of age, or be destroyed.Luna finds shelter in forbidden waters and comes under the protection of her father's greatest enemy, the Sea Witch. As her ward, Luna becomes a fearsome warrior, but struggles with the fear of turning her powerful magic dark.With only days remaining before her seventeenth birthday, Luna finds Ian sailing the seas in search of answers. Luna is determined to escape her father's wrath, and the Sea Witch's plot of revenge, but dark forces won't allow her to live a human life without making an impossible sacrifice.