Ruby sighed. "Actually, I haven't figured it out yet. It just doesn't make any sense!"

The room instantly lost the tension that had built up.

"It's okay, sis," Yang consoled. "I'm sure you'll figure it out soon enough."

Ruby didn't look convinced. "None of my leads got me anywhere, and I don't have any other clues to work off of. How am I supposed to go about investigating now?"

Yang didn't have an answer for her.

"What did Professor Ozpin tell you in the hallway?" asked Weiss, curious of how his advice could possibly be unhelpful.

"He said it was the person I least suspect," she shrugged. "Which doesn't help me much, since it doesn't change the fact that it's still the person who I least suspect. I can't think of any unlikely people having a way in; I just have no clue how to use that fact to my advantage."

Her friends frowned, and everyone sat in thought for a few minutes.

"Why don't we just wait?" Blake suggested. "If the thief shows up again, maybe we'll be able to catch them or at least find another clue. And, if they don't show up again, then it's not too big a deal since you aren't going to lose more cookies, right?"

Ruby brightened. "Yeah, I guess you're right. Okay, Team RWBY - Dismissed! Keep a watchful eye tonight!"

That Night

The sound of footsteps woke Yang. The thief!

She tried to get a look at the figure standing in front of Ruby's desk, but there was only a faint outline - it was too dark. As quietly as she could, Yang slipped out of bed. She landed on the floor louder than she'd have liked, wincing, but the thief didn't seem to have noticed. As she approached, the blonde-haired girl heard the characteristic sound of cookie-eating.

Finally directly behind the mysterious stranger, who she was pretty sure was female, Yang grabbed her shoulders.

"Stop, thief!" she yelled.

The figure froze, and slowly turned its head.

"Yang?" asked a sleepy-sounding Ruby Rose.

"Ruby?" her sister replied in shock.

Ruby looked down at the half-eaten cookie in her hand. "Wow, it was me the whole time?" she questioned drowsily. "That's stupid." She finished off the cookie. "Mmmm. I'm going back to sleep. Good night, Yang."

Yang watched in confusion as her sister walked over to her bed and climbed in. "Ugh," she grunted, massaging her temples. "...Good night, Ruby."