In the film Mirror Mask, the Really Useful Book is a fortune-telling tool for main character Helen. When she needs help, she opens up the seemingly blank book and words magically appear on the pages with just the advice she needs.

Our take on the Really Useful Book is a case-bound journal which includes an invisible ink pen for writing your own secret messages! A black light is included so that you can read and share your words, Plus, Neil Gaiman will be adding mysterious text, which will be printed on the pages in invisible ink. You can discover a hidden message with the turn of each page!