You decide to check out the bookshelf.

As you made your way to the bookshelf, you notice that, aside from three books, the other books had no titles along their spines.

You reach for one of the nameless book and pull it out. As you flip through the pages, you notice that there is only one word that filled the pages in bold print.

NOT

NOT? Can this mean something? Can it be that it's telling you this isn't the book you need to look at?

You place the book back to its original position and look at the three titled books.

"Letters...Numbers Rule Your World...interchange...." You slowly read the titles. "What can they mean?"

You reach over and pull out the book titled Letters. Upon flipping through some of the pages, you see that there is no content. Everything is blank.

You put the book back and retrieve the next book. It is then you see the title of the book on the cover. Numbers Rule Your World...but for some reason, Rule Your World is crossed out with a thick permanent marker of sorts.

What did this mean? You flip through the pages and, like the first book, the pages are also blank.

You put back the book and pull out the last one - interchange. Similarly, the pages are also blank.

Why keep the titles but not the contents? Are they trying to tell you something?

While you save that thought for later, you step back and think about your next destination.

Shall you...