See the full review at http://www.timetoplaymag.com/toys/4757/babalu/my-invisible-diary/
Kids can keep their secrets invisible with My Invisible Diary. There are three styles to choose from: Fairy, Princess & the Pea, and Dancer. Each is sold separately and comes with a 240-page hardcover locking diary, two invisible ink pens, a decoder light, two keys, and a magnetic closure keepsake box for storing everything. Simply write in the diary using the invisible ink pens. Then shine the UV decoder light on the page to read what you've written.