Is someone stealing books from your library? Do you suspect strange stuff is going on amidst of your books? This might be the answer! I have never seen anything like it. Maybe it is a bit to much 007 for you, but the idea is not bad. This book houses a hidden camera. You can be Big Brother (no, not the TV show, but Orwell!) yourself and spy on everybody that comes near this book.
If you think about it, it gives me lots of ideas. If you suspect your husband is having an affair, leave it on your bedside table. He will never notice. If you own a book shop and think people are stealing, hide it amongst the inventory. You will get them! If you think of better uses for this spy book, post it in the comments!