Three demigods wake up on a school bus with no memory of who they are or how they got there. Jason Grace, Piper McLean, and Leo Valdez are taken to Camp Half-Blood, where nobody knows Jason despite the fact that he clearly belongs there. The first Heroes of Olympus novel opens a new chapter in the Riordanverse, expanding the world to include Roman demigods and a threat larger than anything the original series attempted.
