User blog comment:PurplePenguin/The Grunkle Stan Mystery/@comment-24.99.154.251-20130626035855

I've seen all kinds of theories and I personally believe that Grunkle Stan is trying to hide some sort of evil away from Gravity Falls. Like, he hid 2 books (and kept the 1st one) so no one could find them and eventually, Guideon and Dipper found them. Guideon wants all 3 books, and Dipper just wants to learn the secrets of Gravity Falls.

I think all of the friends and villians that Mabel and Dipper meet will eventually come together in a huge fight against the villians.

I don't know, but my brain has all kinds of ideas and when they come together, they don't make sense. :/