A special new edition in celebration of the 20th anniversary of the publication of Harry Potter and the Sorcerer's Stone, with a stunning new cover illustration by Caldecott Medalist Brian Selznick.There is a door at the end of a silent corridor. And it's haunting Harry Potter's dreams. Why else would he be waking in the middle of the night, screaming in terror?It's not just the upcoming O.W.L. exams