3 Years past after Dipper and Mabel Diffend Bill. They Every year summer going back to Gravity Falls. Dipper and Mabel waithing Wendy who come to twins. Dipper saw one mistery person who speak like Bill. And later that person is disapierd. Dipper start to worry about he sir Bill see? How she walking and Thinking in forest she see one girl who never see befor. Later she asking the Wendy and other maybe some body know something about that mistery girl. Who can be this Mistery girl?