After finding a strange book in the forest, Dipper begins to learn about the dark side of Gravity Falls, and suspects that Mabel's new boyfriend is a zombie.
Dipper and Mabel Pines arrive in the remote town of Gravity Falls, Oregon to live with their Great Uncle Stan over the summer at his tourist trap, the Mystery Shack. Dipper begins to discover the town's paranormal side when he discovers a mysterious book detailing strange occurrences that have happened in Gravity Falls, and when he suspects that Mabel's new boyfriend might be a zombie.—Anonymous
Two fraternal twins, Dipper and Mabel Pines, arrive at the remote town of Gravity Falls to spend their summer break with their great uncle Stan, but a mysterious journal hidden in the forest found by Dipper reveals the town's strange and uncanny secrets to the duo, and Dipper tries to save Mabel from her strange new boyfriend who appears to be a zombie, but is actually something much stranger.