It has been four years since (y/n) Cipher went missing in Gravity Falls. After a lot of convincing, Mabel Pines has convinced her twin brother Dipper to go back and meet their friends and family.
But knowing your girlfriend has gone missing isn't easy, is it?
When they all leave the Mystery Shack, Dipper decides to stay behind and searches around the shack.
He enters an unfamiliar room, and as he looks around, finds a strange note with a familiar signature.