Jason wakes up in a school bus holding hands with a girl that he doesn´t know. The girl tells him that he is at Wilderness School and says that she is his girlfriend. Apparently, he is also friends with a guy named Leo. He remembers nothing about his past, but throughout the book he starts remembering bits about it. Then a girl named Annabeth takes him and his friends to a place named Camp Half-Blood. He later discovers that a guy named Percy Jackson is missing and everyone is looking for him. Will he be able to discover where he came from?