Dipper's and Mabel's Guide to Mystery and Nonstop Fun!

Dipper's and Mabel's Guide to Supernatural Mystery and Nonstop Fun! is a book "ghost-written" and illustrated by Rob Renzetti and Shane Houghton, and published by Disney Press. The book was published on October 7, 2014.

Title description
Want to know the best way to thwart the ghost that haunts your local convenience store? Or how to crack a top secret code? Find out in this jam-packed guide featuring tips, activities, and the show's trademark quirky humor. From Dipper's advice on how to handle the supernatural, to unlocking codes and ciphers, to taking Mabel's fun quizzes, this imaginative guide is sure to be a hit with fans of the show!

This hardcover book in the best-selling Guide to Life format features 144 pages of hilarious journal entries, black-and-white images, and a double-sided pull-out poster!

Additional information
Dipper finds an old book in the attic of the Mystery Shack. He thinks it may potentially be cursed but decides to use it anyway to write up information about the mysteries of Gravity Falls, similarly to the journals. Mabel, however, after jumping on Dipper's bed over and over, convinces him to let her write in the book as well. Together they co-write the book, with Dipper's serious and paranoid writing mixing with Mabel's chipper attitude.

Trivia

 * On page 11, Soos is compared to "a giant anime panda creature that makes the forests grow and lets you sleep on his tummy." This is a reference to the Japanese anime film, My Neighbor Totoro. Which was also distributed by Disney in the United States.
 * Mabel says that her favorite book is "True Vampire Blood: The Diary Journal Chronicles: Sequel Moon Descending". The title is a parody of True Blood, The Vampire Diaries, and Twilight.
 * While the book is credited to have been written by Dipper and Mabel Pines, the actual book was written and illustrated by Shane Houghton and Rob Renzetti, a term known as "ghost-writing".