A Hogwarts diary with a lock, two keys and an invisible ink pen for the secrets that really matter. The cover carries a classic gold Hogwarts crest, and inside are 192 wide-ruled pages for spells, discoveries, plans and anything you would rather keep from witches, wizards and Muggles alike. Messages written with the invisible ink ballpoint stay hidden until the pen's built-in light reveals them, and the lock comes with two keys in case one goes missing. At 5.25 x 6.625 inches (about 13.3 x 16.8cm), it slips easily into a bag. It makes a lovely present for any witch or wizard, whether that is a housemate, a teacher or the friend who has reread the series more times than they would admit. Invisible ink pen with a built-in light Lock with two keys 192 wide-ruled pages, about 13.3 x 16.8cm Look out for more lock and key diaries from the Wizarding World, including Harry Potter: Chocolate Frog Squishy Lock & Key Diary, Harry Potter: Hogwarts Castle at Night Lock and Key Diary and Harry Potter: Quidditch Lock and Key Diary.