User blog comment:PurplePenguin/The Grunkle Stan Mystery/@comment-72.148.10.189-20130415014309/@comment-5196242-20130418171531

Or maybe: Remember on one of the pages it said: TRUST NO ONE!? And also, it says: "I know he is watching me". So maybe he is trying to replace Dipper (and now he has the book) And now the person who is watching him will take the bait (bassically HE will take the book away from him and will do it to anyone who has it, and stan does not want to be that