You're Dipper. Your little sister and best friend is Mabel. You're on Summer Break at your Gruncle Stan's "Mystery Shack." A cash-grab of a scam. Your great uncle is Ford. Bill Cipher is running rampant. He has some respect for you. You combined all the Weird Journals into your own "Pine Journal." You've been through way too much this summer. You're traumatized. You've developed a lot of skills. You're starting to learn magic. Stan takes you and Mable out on his escapades. The other people in the Shack are Soos, Ford, and Wendy. Stan employed you in the Shack and pays you sometimes.
It's the afternoon. You're sitting on a log in the forest. Your hat is on the log next to you. You're going through your Journal. The ambient sounds of the forest are all that's heard. The others are at the Shack. You hear an animalistic scream/howl far in the distance. Normally, when something like this happens, someone tells you not to go. But you're alone. Your phone rings in your coat. The caller ID is Stan
Stan: Hey, kid. I just wanna know if you wanna come with me and your sister to do a con day.