Harry Realizes the Diadem is Hidden in the Room of Requirement

PAGES: 616-618

After hearing Helena Ravenclaw's story, Harry deduces that Lord Voldemort retrieved the diadem from Albania and returned it to Hogwarts, hiding it in the Room of Requirement. He connects this to his own experience of hiding his Potions book in the same room. Determined, Harry races toward the Room of Requirement to retrieve the Horcrux.