Tom Riddle\'s Diary: What is it? In Harry Potter and the Chamber of Secrets, Tom Riddle stored his secrets in his notebook. Now you can, too! Just write in the notebook using the included pen, then wave the wand over the writing and the light will make your writing appear! About the product A magician shouldn\'t reveal his tricks, but the UV tip in the wand reveals the pen\'s UV-sensitive ink. It\'s officially licensed Harry Potter merch, and makes a great diary for hiding secret spells, incantations, and even shopping lists. Why you should buy it It\'s a truly magical item for any Harry Potter fan. Order Tom Riddle\'s Diary today! | Harry Potter Tom Riddle\'s Diary Notebook, Pen and Torch