Twelve-year-old twins Dipper and Mabel Pines came for summer vacation to their eccentric uncle Stan, who lives in the small town of Gravity Falls, Oregon. It seems that a joyless vacation awaits the brother and sister: they will work at the "Predator of Miracles" - a bench for tourists... What a bore! But Dipper finds a strange diary in the forest that reveals some of the town's secrets!