The Enigma Machine

Author note: This is an idea that wouldn't leave me alone so I started it at 5:30am. I'm sorry it's taken me so long but my muse was misbehaving and wouldn't co-operate. This story is G/S but has references to C/W (sorry Nick!)

Disclaimer: I don't own CSI, any questions?

"Not again! That's the third time this shift!" Grissom thumped his head down on the desk in frustration. At that moment Catherine walked by his office and decided a change of route was in order.

"Gil?" Grissom looked up at the sound of genuine concern in his best friend's voice, "What's the matter?" He put his head back down on the desk as he handed her a small square of fluorescent yellow paper. Cath grinned, now she knew what was bugging him, but she loved to see him squirm, "It's a post-it."

Grissom raised his head to meet her gaze. She was staring straight back at him, not letting slip one once of the mischief lurking within.

"It's not actually the paper that's annoying me, surprisingly. It is what happens to be written on it."

"G.L.R.G.F.S.S.F.E. I know what you mean. I've been getting them too, so has Warrick." At this Grissom swiftly lifted his head and grinned as Catherine went very red in the face.

"What do you think it means?" Catherine said hastily

"That's just the problem! I don't know! Come on, we have real work to do." As Grissom and Catherine left his office another mischievous person looked on, a small, spiky-haired person who had to try extremely hard not to laugh. When they had passed by his hiding place he whispered, "Let the games begin!"

"Greg! Where the hell have you been? I need those results! I swear if you mess me once more..."

Over the next few weeks, the gang's curiosity grew. This scheme had the investigators very confused. For the first fortnight Grissom, Catherine, Sara, Nick and Warrick had all received one post-it at the start of every shift. Then Nick walked into work simply expecting to see it with his mail, he wasn't worried as it wasn't harming him, but it wasn't there.

Walking into the locker room he found Sara desperately trying to wake herself up, by any method available. "Hey Sara! ... Sara?" She looked up looking vaguely confused, as if she wasn't sure where she was. "Are you okay, hun?"

"Erm... yeah, sure."

"How many shifts is this?"

"This is the start of my forth."

"Ouch! Just don't let Grissom catch you at it, or you'll be heading top speed for lecture land."

"I know."

"By the way did you get your mystery post-it this shift?"

"Yeah, why?"

"'Coz I didn't."

"Hey! No fair!" Nick just grinned and walked away.

A few minutes later Sara walked as fast as her very tired legs could carry her into the breakroom. She announced, "This post-it thing is getting weird! After shift, everybody meet at the diner and bring all your post-its! We have to figure this out!"

After sitting in the diner for about fifteen minutes, this was the scene: Sara was doing a very good (if unintentional) impression of Inspector Clueso. Grissom was leaning over her shoulder and trying to get as close to it as he could to Sara's exposed skin without touching it. Catherine and Warrick, who had both arrived at the same time, late, red in the face and with an assortment of each other's post-its, they were now trying to stare into each other's eyes without being noticed. Nick was watching between the two pairs trying with all his might not to laugh.

"We could finger print them, maybe?"

"I've tr..." Grissom's voice had been so near to her ear that Sara had jumped a full two feet out of her chair. What also happened made the other three look up in shock. Grissom's voice had been very low and husky!

"Ahem I've tried that no prints so the person behind this must be wearing gloves." He said this remarkably fast and then ducked his head.

At this point, Nick could contain his laughter no more. When he finally managed to regain control over himself, he heard Sara talking, "Hang on! Whoa guys! Who ever is doing this is making a mistake!"

"Erm..." Warrick pulled his glance in a painfully slowly motion away from Catherine and looked up ay Sara, "Could you translate that for me?"

"On some of these, he..."

"Hey!" Nick interrupted looking offended.

"What?"

"You said 'he'! For all we know the culprit is a woman! Back me up, Warrick!"

"Huh?"

"Okay, sorry" Sara apologised and continued, "On some of these, the person finishes with 'F.E.' but on others he finishes with just 'F'. That's weird, right?"

"Yeah but nobody kill me for saying this but," Nick looked around anxiously, "Why do we care? It's not doing us any harm, right?"

Before anyone could answer, Sara threw a plastic bottle of ketchup at Nick's face.

"Ow!"