Gravity Falls: A New Beginning

Mabel and Dipper are 15, almost 16 years old, when they finally return to Gravity Falls for the summer. Stan and Ford are still close, but what happens when Stan starts to exhibit some odd behavior. Then, Mabel starts to have night terrors but stays quiet. Why is this happening? And worse... could Bill be awake?

Who knows...but what will happen to the twins? What would happen... to Gravity Falls