Well, on the inside there's a short message that tells you a phone number.
I'm guessing they're going to set up some kind of hotline thing or something while they're on tour.
Also, the back of the booklets have some conspiricy shit, or something.
And, to help you find out the right order of the "hidden message" you put the books in order to the background of the back of the booklets, and it spells out "FA-MI-LY"