Después de que Helga y Arnold fueran transferidos a Gravity Falls una trama del futuro se desarrolla sin que Dipper Pines, Mabel Pines, Helga Pataky, Arnold Shortman lo sepan, que paso veinte años después?, pero sobre todo que es el libro numero cuatro

After some scare in Hillwood, Helga and HIM go west to a small cruddy town to get away from the city dangers. But Gravity Falls turns out to be better to her, especially when the twins show up. RATED M FOR DARK OVERTONES, UNDERTONES AND PLAIN DARKNESS. Also, a few secksuals will occur. Stay tuned!

A very odd I am going to try out. Rated M for future controversial stuff such as incest and drugs.