Your father moved you from your home to Gravity Falls, Oregon, a place you haven't been in since you were four years old. Your mother was a thing of the past, a figure of your early childhood that you don't know much about. But when you meet a mysterious triangle in the woods behind your house, everything gets thrown off balance. You discover things that you never knew, both about your mother and yourself. And to think that it all started with a deal from the past.