The Pines return to Gravity Falls, to find their favorite town still full of wonder, mystery, and danger. But, for Dipper, the danger is much more unusual than he is used to- caught between two friends that both seem to want to possess his heart for their own. Even, it seems, if that means tearing the heart of their rival out to get what they want.

Dipper was killed in Weirdmaggeddon. Of course Mabel's upset about it, but it's been a year and she's been able to move on. When she returns to Gravity Falls next summer, however, a series of odd occurrences lead her to believe her brother isn't as gone as she thought he was.