Meghan Chase is turning 16, and odd things are happening. Her four-year-old half-brother, Ethan, is clingier than usual, and a tutoring session with the school hunk goes horribly wrong. But her best friend, Robbie, is always there for her, even when Meghan comes home to find her mother unconscious and her brother snarling like an animal. Robbie knows whats happened - Ethan has been taken by the fey, a changeling left in his place, and the only way Ethan can be brought back is if Meghan embraces the truth that the fey are real and that she is half-fey herself. She agrees, but her agreement is nearly the most active part she plays in her own adventure.