Book excerpt: Dipper and Mabel are back for the fourth installment of the Disney Gravity Falls cinestory comic series from Joe Books. For their summer vacation, Californian twelve-year-old twins Dipper and Mabel Pines are dropped off to stay with their great uncle, Grunkle Stan, in the town of Gravity Falls, Oregon. Things are not what they seem in this small town, and with the help of a mysterious journal that Dipper finds in the forest, they realize that their everyday life has changed. Fans of the hit show will love this graphic novel companion to episodes from the first season!