A/N: A second post to tell you what the number means. I'm only posting this because it's nice weather here and i'm in a good mood.

"It's the man that had the number that I'm more interested in." Matthew Kieln stated. "I presume he's dead."

"What makes you think anyone is dead?" Mac inquired.

"He wouldn't have given the number up willingly and I doubt that NYPD would be trying to find out who he is if he wasn't dead."

Lindsay looked at Mac who nodded in acquiescence. She pulled out a photograph from the file and handed it to Matthew.

"His name is Ronald Simons. He's a mathematics professor at Brown. He is or should I say was currently on sabbatical." Matthew handed Lindsay back the picture.

"Does he have any family we should notify?" Flack asked.

"No. Ron was a genius; he was a good teacher but not exactly a people person. He had no family."

"How did you make an ID from a number?" Mac inquired.

"Ron was part of a group called Pi."

"As in pumpkin?" Flack asked.

"No as in the Greek letter pi. P-I." Becky explained. "It represents a number which is used for amongst other things to determine the circumference of a circle."

"3.14159." Flack stated. "I passed high school Geometry."

"That's just the short version that's used but pi doesn't ever stop or repeat the pattern of numbers." Becky explained.

"And this number has something to do with that?" Lindsay asked.

"Pi is officially a group of the brightest mathematicians in the country. They officially help the government with research."

"And unofficially?" Mac prompted.

"That's classified." Matthew stated. "The number is an identification code of sorts; its part of the pi sequence, every member has an individual code which if there is a problem they have to call in to a number."

"Do you have an idea what he would be doing in Manhattan with only that number on him? No ID, no money." Lindsay replied.

"Ron was slightly paranoid. He hardly ever carried money or ID unless he was going out specifically buy something. He probably has a hotel room somewhere which has a safe in the room, and then he'll have everything inside a couple strong boxes inside the safe. He was a genius."

"You seem to know a lot about this organisation." Mac stated.

"I'm a member." He paused. "How did Ron die?"

"Heart attack." Lindsay replied. "We have no reason to believe otherwise."

"I'd like to take care of the arrangements for his funeral." Matthew requested.

"Does he have a next of kin listed anywhere?" Mac asked. "They'll require that to release the body."

Matthew pulled a piece of paper out of his pocket and handed it to him.

"The organisation is his next of kin."

"Which is why he kept the number on him knowing someone would eventually connect the dots if something happened to him." Lindsay guessed.

"Very good Ms Monroe."

"Flack why don't you take the Professor down to the morgue and help him get the paperwork started." Mac suggested. "Then try and track down his hotel room."

"Sure thing Mac." Flack stated.

"Lindsay you can take an hour with your sister we'll page you if anything new comes up." Mac told her.

"Thanks Mac."

CSI NY CSI NY

Lindsay and Becky ended up getting coffee down the street.

"It's good to see you Becky."

"It's good to see you too." Becky replied. "Now tell me something."

"What?" Lindsay asked.

"Is he any good in bed?"

"What? Who?" Lindsay was a little surprised at the question.

"The cute cop who insists on calling you Montana." Becky looked at her.

"Why do you think I'm sleeping with him?" Lindsay asked trying to looking nonchalant and failing miserably.

"I saw the way he looked at you. You're either sleeping with him or he has serious crush and since you're blushing I'm guessing the former rather than the latter."

"No comment." Lindsay replied.

"That good huh?" Becky chuckled.

"So how long have you been sleeping with your Professor?" Lindsay flipped the subject around on Becky.

"How did you… I walked right into that one didn't I?"

"Oh yeah." Lindsay smiled. "I'll make you a deal, you don't tell Mom or Dad or Adam or Clay about Danny and I won't tell them about the Professor."

"Deal."

"But do you think sleeping with your Professor is a good idea?"

"He's just my thesis advisor; he doesn't mark my thesis so there isn't a conflict of interest. He's single, in good health and he makes me feel good about myself." Becky stated.

"How long has it been going on?"

"A couple months. You?"

"A couple of weeks. We're still figuring it all out." Lindsay admitted.

TBC