But she doesn't know how weird until she catches him peeling off his face -- and realizes that "Mr. Smith" is really an alien! At first no one will believe her except Peter Thompson, the class brain. When Peter and Susan discover Mr. Smith's horrible plans for their classmates, they know they have to act fast. Only they can get rid of their extraterrestrial visitor -- and save the rest of the sixth-grade class from a fate worse than math tests!

    Journal 3 brims with every page ever seen on the Gravity Falls show plus all-new pages with monsters and secrets, notes from Dipper and Mabel, and the Author’s full story.A 288-page full-color jacketed hardcover version of Journal 3—plus, the book jacket doubles as an exclusive poster.