Designed to help keep all your little one's top secret notes and diary entries stored both in style and away from prying eyes, the Hinkler My Secret Book Of Stuff Activity Book is sure to impress. Complete with an invisible ink pen with a super cool UV light topper, this padded activity book is sure to provide hours of endless entertainment. With plenty of room for writing personal notes, diary entries, and gossip, this must-have activity book is sure to impress.