Children and adults alike will have hours of fun with the popular Mr Mystery Invisible Ink Game Books. The invisible ink pen works just like magic! Draw over empty spaces and watch as hidden answers are instantly revealed. This tall paperback book is the perfect size for a backpack or handbag, and being plastic-wrapped with the invisible ink pen makes storage and use of this product so easy for people on the go! For mystery fans of all ages, these books are great for at home, on holidays or even in the car. | 
