Prudence Mckenzie is a 12 year old girl who has lived her whole life in Gravity Falls, Oregon and she wishes to leave her boring town. Not only is there nothing to do but she has to work at The Mystery Shack owned by Mr.Pines but one summer that all changes. When Mr.Pines' great niece and nephew stay for the summer they all discover there's more to this town then meets the eye. As they solve mysteries and discover new things they find out theirs something bigger and more powerful then them in their little town.