Clary finds Jace cheating on her at Pandemonium, so she runs away. But a new demon attacks her, and she is saved by Percy, and Annabeth. She finds out she is a demigod, and Valentine is not her father. While at Camp Half Blood, trouble arises in New York and Clary, the Seven, and Nico attend the school the shadowhunters go to. Will there be Clace again, and what is the new trouble?