This small hand-made book is the third Bookhouse Institute microhunt.
Keep your eyes out as they will be dropped around at random locations in the UK until the Bookhouse Institute decides to stop doing that and moves onto something else.
If you're lucky enough to find one out and about, and you manage to solve the puzzles inside, then it'll lead you to something you can hang on the wall and some bragging rights.
Remember, librarians are your friends. You could always ask one to help you. They're like the internet... only better.