Battling the I-Have-Nothing-To-Do Blues? Never fear, this book is here! Top Secret: The Ultimate Invisible Ink Activity Book is jam-packed with hidden messages, secret codes, games, jokes, and more activities to help bust even the most unbeatable boredom. You'll see both visible (and invisible) activities, fabulous facts, and mysterious messages throughout the 64 full-color pages and uncover invisible ink printed notes and images on every page. Included is one UV pen to write and reveal hidden messages in the book or on your own!