Brother and sister are really upset because instead of spending the holidays the way they want, they have to help Stan in his shop of trinkets. But once Dipper walking through the woods, accidentally finds a strange diary, under mysterious number 3. He does not know that the owner of these records is his mysterious relative. From this point on boring and tedious vacation boys turn into the most exciting detective adventures. It turns out their uncle is not so simple, and the town of Gravity falls is full of unexpected surprises and mystical secrets.
Dipper pines decides to whatever was to uncover the mysteries of the town and to track down the owner of the diary to get answers to many questions. He pulls his sister's plans. On the way to the unraveling of the children find new friends and even love. And summer days will be hot and interesting!