"I'm still not used to the golf cart," I stumble around, looking for the porch. "Why do we have to go so fast?"

"It's a new record!" Wendy states. "Today it only took 3 minutes and 47 seconds to get from your house to the Shack!"

"You say that like it's a good thing."

Inside the Mystery Shack gift shop, Mabel is sitting at the register, reluctantly draining a tourist of their money, while Dipper is sitting on a chair, reading a book.

"Hey Dipper," Wendy says happily. "Whatcha reading?"

"Huh? Oh, hey, Wendy!" He attempts stuffing the book onto a nearby bookshelf and leans against it. "Nothing. I mean, I'm not reading anything." He laughs nervously.

"Alright." Wendy shrugs it off. "I guess it's back to the salt mines, then."

But I noticed something. When Dipper put the book on the shelf, there was a flash of gold on the cover. A familiar flash.

"Dipper, what were you really reading?" I ask.

"What? I wasn't reading anything!" He throws out his arms, knocking over the bookshelf, scattering all of the books, and sending up a plume of dust.

"Smooth work, Dippingsauce." Mabel laughs.

I walk over to where the book fell, picking it up to reveal a hand with the letter 3 inscribed in it.

"Dipper Pines…what have you been up to?"

"I can explain!" He yells. "It's Greek Mythology! It's by Rick Riordan!"

"Calm down!" I whisper. I grab his arm. "Let's take this somewhere else."

"This-this is amazing!" Dipper paces around the attic floor like he has for the last fifteen minutes since I told him about my book. "You've had the first book all along?"

I nod.

"How was it outside of Gravity Falls?"

"Honestly, I didn't even know this town existed until a week ago." I shrug. "I sort of though the town was just…made up."

"Oh, man, all of this is just…" He scratches his head. "Look at this! I'm losing hair!"

"Why are you worried?" I ask. "This is so amazing!"

"Dipstick always worries." Mabel shoves him. "Part of why we got into the whole thing with the books."

"Wait…" I realize. "Who has Book 2?"

"There are a few theories floating around." Dipper slides a magazine across the floor towards me. "The prime suspect…"

The back cover of the magazine has a short boy with big white hair and a blue suit plastered on it. The words 'Lil' Gideon: Child Psychic' are in big white letters above the picture.

"Ugh, he's such a creep!" Mabel exclaims. "He doesn't deserve that book."

"So, do we try to get the book?"

"No way." Dipper shakes his head. "Gideon may be insane, but he's dangerous. We'll get the book when it's time."

"We need to make a promise." I decide. "A pact. We need to swear our secrecy."

"Okay." Mabel agrees. "Hands in the middle."

I grab one of Dipper's hands. He blushes.

"I promise to never tell any of this to anybody, no matter the circumstances." Mabel says.

"I promise." Dipper adds.

There is a pause.

"Autumn?"

"I promise."