She gave up on the library.
Frustration had won out. She couldn't stand the idea of pouring over non-clue after non-clue anymore. She stomped off towards her lab, startling at least one banana guard.
She began examining the body in front of her intently; all limbs intact, perfectly preserved organs, caramel filled; perfect conditions, minus being dead.
She began her work, cutting, examining, sewing, and injecting. Part of her wondered if this was how they were made. She shuddered and brushed off the thought. Eventually, she came to the liver. Or what should have been the liver. Instead she found a round, rubbery, tight lipped bag, filled with air. She touched it, and out came the flatulent sound she expected.
"Very funny, Marceline."
"Aww, how'd you know it was me?" came a voice, as Marceline swooped out of the shadows and lay down on an examination table.
"I would have caught Finn and Jake by know. And really, a whoopee cushion?"
"Well, I figured you could use a little humour, considering how... busy you've been."
"Yeah." There was a silence. She knew what she wanted to ask, what she'd already asked, but she already knew that wouldn't work.
"Marcy?"
Marceline, who'd been avoiding eye contact at all costs, looked back up from the scalpel she'd been playing with.
"Do you remember that conversation we had?"
"Look, I told you, I don't wanna-"
"I know, I know, not that conversation. The one right before I met with the archeologists."
"It's been awhile..." she started, clearly not knowing where PB was going with this.
"You asked me if I believed in Glob or Cosmic Owl or whatever." Her stare was piercing Marceline as she spoke.
"Look, I'm sorry if I got you all psyched out before what you saw, but-"
"Do you?"
Another silence. While it was just as tense, this was a more suspicious silence. "Do I what?"
"Do you believe in Glob? Or Cosmic Owl? What do you believe in?"
Not so much a silence as a pause, as she decided whether or not to speak, before finally conceding. "Sometimes the world is a dark place. Scary place. Sometimes hell breaks loose. It's comforting to believe there's something out there, something big, and it's on your side. So yeah, when I need to, I believe. Course, it probably wouldn't be on my side, given the collateral I've caused." She gave an uncomfortable chuckle, as one does when they here a rather morbid joke.
PB didn't know what to do with this information. She wouldn't know what she'd do with it no matter what the answer was, but somewhere in her she knew this was a part of the puzzle. "Then I hope you can keep believing."
"And I hope you can find something for when the world is a dark place." She picked up a needle from the tool tray, poking her finger at it to test its sharpness, and just piercing her skin. "We all need a narcotic sometimes."