A/N: So, normally I don't completely re-write history, but I had this idea and it keeps pestering me. The premise: what if, because of his age, Reid went to Andi Swann's human trafficking team when he graduated from the Academy, instead of the BAU? He's working undercover when the BAU comes to his town to catch a serial killer. Will Andi share her undercover agent? Will she reveal that he's more than a simple informant? What happens to the delicate balance of a life undercover when you experience love at first sight? Put this circa when Rossi joins the team. That means our co-characters are Morgan, Prentiss, JJ, Hotch, Rossi & Garcia.

DISCLAIMER: I may have gotten creative with the details, but I don't own Criminal Minds or its characters, nor do I have any rights or receive any profits.

Reid Undercover

Chapter 1: Serial Killer on the Loose

"Andi, it's Ricky." Ricky, a/k/a Dr. Spencer Reid, was working undercover for the human trafficking division (HTD) of the FBI. He was one of the youngest agents the FBI had ever had and he blended in perfectly with the kids on the street once he'd grown his curly brown hair out and used a needle to create fake track marks on his arm. That was his cover; a young male prostitute with a drug problem.

"What's wrong?" Andi Swann inquired. She was the head of the HTD and he wasn't due to check in with her for four more days.

"There's been a string of cases involving missing prostitutes . . . I think that there may be a serial killer here."

"Well what besides the facts that the victims were prostitutes links them?"

"There have been five so far. All young males with brown hair and brown eyes. Four of the five were Latino, the first kid was non-Hispanic but had those features. One a week for five weeks now. Their abductor appears to keep them for a few days, binds them, sexually assaults them anally and orally . . . he kills with a knife slicing the throat along the carotid. He mutilates their genitals post-mortem. The fifth boy was just fished out of the river today. He's using it to destroy DNA and trace evidence. I really think this is something the BAU needs to address."

"Why in the world haven't they been called in by the local PD?"

"Probably because no one cares about a few Latino male prostitutes. There are much bigger fish to fry."

"Okay, so there's probably what, a week until the next body?"

"Yes."

"Alright. I've known the Chief of the BAU, Aaron Hotchner for a long time. I'll pass along the information but I'm not telling him you're an agent. Normally they don't step in without an invitation from LLE, but this might be compelling enough. If they need to meet with you, you're my informant; you will stay in character the entire time you are cooperating with them. You've fully infiltrated the street life and you have your ear to the pavement; I'm not jeopardizing that."

"I understand. It's not a problem."

"Call me back in one hour and I'll let you know what Hotchner has to say."

"Yes ma'am."