When Mable and Dipper go back to Gravity Falls after 6 years. Exploring the woods and finding a lost boy they help him out but wonder how he got there and how he was still alive. Soon bill comes back and this boy is willing to help them as payback for helping him. Will they find out more about the boy they saved? is he really on there side? will love blossom in the heat of war? Read to find out.