The Invisible Book of Invisibility is a collectible objects.
|“||An essential read for anyone intrigued by invisibility||”|
The Invisible Book of Invisibility is a book found in the empty patch where a book should be, on the left of the cage, and above the candle in Harry Potter and the Prisoner of Azkaban, Chapter 4, Moment 1.
You can find the book in your trunk, but instead of the picture there is an empty space. After all, it is an invisible book - literally. In Harry Potter and the Prisoner of Azkaban you can read the bookseller complaining that he ordered a lot of these books, but has never seen them again after the delivery.