Set six months after the House of Hades, and in the Harry's fifth year at Hogwarts. Percy Jackson, Son of Poseidon, Hero of Olympus and more recently, Survivor of Tartarus, has been given a quest, along with his two cousins Nico Di Angelo and Thalia Grace, to go undercover to a school for magic for a year, in England. Their objective? Protect Harry Potter, Ron Weasley and Hermione Granger. Harry has had a rough summer, what with the dementor attack, the hearing and the Dursleys. He thinks life back at Hogwarts would be better, only to realize that he would be facing a year of ignorance and scorn, but when the golden trio meet the children of the Big three, who are "American Exchange Students", will they become friends, or worst enemies.