Pines Academy

[Original AU where Dipper and Mabel's timeline is swapped with the timeline for A Tale of Two Stans]

"As a wealthy and intelligent man, Stanford Pines had plenty of enemies. Mabel had seen the list of suspects herself. They all had their own page with a Polaroid of a headshot. Each page was kept in a heavy folder that the agents had given to her parents before they proposed an investigation. . ."

Mason Pines mysteriously went missing approximately 1 year, 6 months, and 18 days ago.

Now, his twin sister is determined to find her brother. No matter what it takes