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This book is set after season 1 of the show. This book is really great and a must have for fans of Gravity Falls. This book is written by Dipper and Mabel (as the title says) and it tries to give the reader insight about the strange things that happen in the town of Gravity Falls. The book is very funny, while Dipper tries to be rational and Mabel just has fun (lots of it). Again there are guest writing(appearances?) by the other main cast like Grunkle Stan, Soos, Wendy, even Bill and Gideon come to say hello. Finally what's a Gravity Falls book without mysteries? While there are no invisible writings there are loads of codes and ciphers for fans to decode that give us hints about the future of the show. As of the writing of this review only one episode remains till the series ends, which is sad but like all good things summers end too.