Harry Potter, Ron Weasley, Hermione Granger, Luna Lovegood, Ginny Weasley, Neville Longbottom, Draco Malfoy, and Blaise Zabini go to New York City and end up on Long Island. They go inside Camp Half-blood. They meet Percy Jackson, Annabeth Chase, Grover Underwood, Nico Di Angelo, Jason Grace, Piper McLean, Leo Valdez, Hazel Levseque, and Frank Zhang. They all go on a giant quest to save the world. Draco and Hermione have become a couple after Ron and Hermione broke up.