The Phantom Of The Shack (BillDip)
Phantom of the Opera Gravity Falls AU
Dipper is confined to the Shack when all he wants is to explore and find out the secrets of the town that his grunckle a are so fascinated about.
One night, On the big stage when the show is taking place a mysterious event happens causing the whole employment and show into chaos.
It doesn't help the fact that dipper has been receiving weird dreams.
And what about that man that demands the profit?
(Yes it basically phantom of the opera but gravity falls deal with it. :P.)