Sometime in the future, an aspiring author writes a book about Bill Cipher and his role in the Transcendence.
Only it is an epic fantasy about the deadly conflict between Bill Cipher and Alcor the Dreambender that spans ten thousand years and cumulates in an epic final battle between the two in the town of Gravity Falls, which inadvertently causes the Transcendence, and ends with Alcor devouring Bill Cipher and absorbing all his power as his own.
It includes such things as a dramatic, romantic sub-plot between Mizar (In this version, Alcor’s half-demon daughter) and the Woodsman (In this version a human soul enslaved and warped by Bill Cipher.) A blood soaked origin story for a character who is in no way based off the infamous demon hunter Wendy Corduroy. Etc. Etc.
It of course is nothing but pure fiction, and too be fair, the author doesn’t claim it to be anything but. However, in several places the story hits uncomfortably close to the truth. For example, one scene has a boy named Tyrone Spruce sacrifice himself to Alcor in order to save his twin sister, (thus giving Alcor the extra power needed to defeat Bill Cipher,) and whom the author admits is very loosely inspired by the story of a boy who was in Gravity Falls visiting his great uncle, and was killed during the Transcendence.
There is a sub-plot about an occultist who runs a tacky tourist trap by day, but a night secretly works to avenge his twin brother who was destroyed by the machinations of Bill Cipher. (The author once visited the Mystery Shack when he was six, and wrote the character in honor of the memory.)
There’s a sub-story of a rich heiress who summons Alcor in order to have him banish a ghost which haunts her family. Alcor agrees, but as price, the Heiress is forced to confront the past crimes of her family and walks away a better person for it.
And so on and so forth.
Dipper is partially uncomfortable about the story which hits very close to home for him, but that part is drowned out by the nerdy part which revels in the story and the demonic part when preens at being the center of the story.
Bonuses:
– If the Author actually read Twin Souls, was disappointed to discover it was a trashy romance, and vowed to do better.