Twin brother and sister Dipper and Mabel Pines are in for an unexpected adventure when they spend the summer with their great uncle in the mysterious town of Gravity Falls, Oregon, in the Disney Channel animated comedy "Gravity Falls." Upon their arrival, Dipper and Mabel's huckster great uncle, also known as Stan Pines, enlists the siblings' help in running the Mystery Shack, a tourist trap he owns that overcharges unsuspecting customers. Although Dipper and Mabel quickly discover the Mystery Shack itself is a hoax, they sense there is something strange about their new town and together they begin to unlock the secrets of Gravity Falls.

Thrust into their new summer home, the fish-out-of-water twins try to adapt to their weird surroundings, especially Grunkle Stan, whose insatiable appetite for money drives him to spin every opportunity into a financial advantage. While Dipper grumbles about the prospect of the same boring routine of working at Grunkle Stan's hokey shop, his extremely optimistic sister seizes the chance to seek out an epic summer romance.

However, summer becomes much more interesting for the siblings after Dipper inadvertently uncovers a cryptic journal that offers insight into the strange and wondrous mysteries of Gravity Falls. Before long, Dipper begins noticing the town's idiosyncrasies, and with the book in tow and his enthusiastic desire to vanquish evil, he sets out to investigate the town's secrets. Trapped together in the small isolated town, the siblings quickly realize they need each other to battle the imminent mysteries lurking in Gravity Falls. Meanwhile, when he isn't busy trying to make a quick buck from his unsuspecting customers, Grunkle Stan guards his own secret that might hold the key to unlocking the mysteries of Gravity Falls.