The seven of the prophecy, Percy Jackson, Annabeth Chase, Jason Grace, Piper Mclean, Frank Zhang, Hazel Levesque, and Leo Valdez have been assigned a new mission from Chiron. Ship off to a British boarding school called Hogwarts. Their goal? Protect Harry Potter from Lord Voldemort. But when a new ally for Lord Voldemort emerges, how will The Seven and the Golden Trio cope?