A/N: This is a Y/N insert story for Law and Order: Special Victims Unit (because I'm OBSESSED). The main crime is based around a character similar to William Lewis. Bear with me I go into graphic detail about the investigations because I too am interested in investigation. ENJOY!

Summary: Y/N is a new detective to the Manhattan SVU. She is young and cunning, but extremely intelligent. When one of the biggest cases lands on Lieutenant Olivia Benson's desk, she must navigate the minefield of a dangerous serial rapist and murderer, professionally jealous coworkers, and a budding romance with a certain ADA.

Y/N never thought she'd be a cop. Her entire family had been in the military for some period of time, and though she never dreamed of joining the military. She swore she would never join the military because of the stress it caused her family that she so desperately wanted away from. She spent her first year of college majoring in the farthest subject she could think of; theatre. It had interested her throughout high school, so she gave it a shot. But as she progressed through the first semester, she felt unfulfilled.

She tried to push those feelings away, but finally came to a conclusion; she needed to serve. She needed to make a difference. She need to help people. She decided it was in her blood, so she changed her major to criminal justice and graduated early with her bachelor's degree with honors at the age of 21. She moved to New York City and joined the police academy. Her training went quick, and her superiors saw great potential in her. She was physically very strong, able to take on her toughest opponents, but also incredibly cunning, able to outwit the smartest of her peers and superiors. With looks that could kill and a feminine quality that could be used to their advantage, she had made Detective in her third year out. She worked with the Bronx SVU for a year before a disagreement with her very strict Captain had her transferred.

That brought her here, twenty-seven years old, standing outside the NYPD Manhattan SVU in the December snow with an evidence box full of her desk items. Taking in a deep breath, she dragged up the courage to enter the building. She stepped into the elevator, pressing the button for her floor when a voice called out.

"Hold the elevator, please!"

She pressed her elbow firmly against the door, stopping its movement. A tall man with coiffed chestnut hair stepped in.

"Hey, thanks," he huffed, taking a sip of the steaming coffee in his hand.

"No problem," Y/N replied with a small smile.

"You new here?" he asked, eyeing the evidence box in her hands.

"Yes, I'm Y/N. Y/N Y/L/N," replied, moving the box into one arm so you could shake his hand.

The elevator doors dinged open, and you followed him into the bullpen.

"Ah, the Detective from the Bronx. I'm Detective Carisi," he said, leading Y/N over to the desks that had other Detectives sitting at them. "You can call me Sonny. Everyone does."

"No one calls you that," a blond Detective writing on a legal pad said, rolling her eyes.

"Some people do," Carisi said huffingly.

"No one calls you that," an older black man said. "You must be the new Detective. Y/N, right?"

"Yep, that's me!" she said cheerily.

"Cool. You can set your stuff right here," he leaned across his own desk to pat the top of the empty one against it. "This'll be your place. I'm Fin. That's Amanda," the blond waved, "and you met Carisi. Liv, our Lietunant, is in there," he pointed to the door. "You should go let her know you're here."

Y/N set the evidence box down on the desk and removed her grey scarf, jacket, and gloves. She smoothed the nonexistent creases from her burgundy blouse before walking over to the Lieutenant's slightly opened door and knocking.

"Come on in!" a woman's voice called.

Y/N walked in to see a middle aged woman with olive skin and brown eyes behind a computer. She had on thick brimmed glasses and her hair fell in loose curls. She was very pretty for a cop.

"Hi," Y/N said, stepping further into the room. "I'm your new Detective, Y/N."

"Ah yes, have a seat. You're early," she stated, removing her reading glasses and glancing at the clock that read 7:00 AM.

"I tend to be early," she said. "I don't like being late…" she glanced down at her hands for a moment, as if remembering something, before shaking the thought away and smiling again. "I hope that's okay."

"No, no, it's fine. I'm Olivia. I'm the Lieutenant in charge of Manhattan SVU. The quick run down of the place is this; I like a free exchange of ideas. That being said, I'm also usually right," she smirked and Y/N chuckled. "Let's talk about why you were transferred here."

Y/N tensed, recalling the case that led to her transfer.

"I got into a… disagreement for lack of a better word, with my Captain back in the Bronx… We were working a case, we'd located a bunch of big-spender Johns who were hosting a party, and they were getting girls from a big-time pimp that they'd been after for years, since before I'd even graduated… He wanted to raid before things even got started. I told him if we did that, they'd be expecting us. That we needed to wait for an hour or two for them to get drunk and comfortable. We'd tried to raid two months earlier and we went in too early. They were ready and they scattered. He shot me down immediately. He never really liked me. We disagreed a lot. I'm too 'pig headed and hot tempered,'" Y/N placed air quotes around the phrase. "Anyway, we went along with his plan, and I was right. They were waiting for us. And they ran. The Johns got away without being ID'd and the pimps got the girls. It was the same as last time. The squad was scolded for not learning from our past mistakes, and I got upset and shot back that he was the one who hadn't learned anything. Next thing I knew I was being transferred."

"Well, like I said, I like a free exchange of ideas. I've been warned by your Captain about your impulses," the young Detective shied under comment. "I'm going to ask that you run everything by me before executing, but I like a good Detective who follows a good instinct."

Y/N let out a slight sigh of relief and smiled at the Lieutenant. She opened her mouth to continue to conversation when the door opened. Y/N turned around in her seat to face a man with tired eyes wearing a three piece suit and a blue and red striped tie. He had short hair that was a little dissolved, as if he was running his hands through his hair. He carried a briefcase.

"Liv I have-" his eyes landed on Y/N and narrowed. "Who's this?"

"This is our new Detective, Y/N Y/L/N. Y/L/N, this is ADA Rafael Barba."

The Detective's eyes widened and she stood, extending her hand to shake his. He ignored her, raking his eyes up and down, analyzing her. He stepped to the Lieutenant's desk and handed her a file, setting his briefcase on the desk.

"I went over those files for the Korosky case. There's not enough evidence. The DA won't touch this unless you can bring me more, or drop the rape-murder charges."

"Barba we've got everything we possibly could," Olivia sighed, rubbing her eyes. "He's good for this."

"Well you must have missed something. Go through it all again, with the finest toothed comb. Maybe give it to Nancy Drew over there," he said, jerking his head towards Y/N. " Fresh eyes."

"Y/N?" Olivia asked.

"Absolutely. I'm on it," she replied, knowing this was her opportunity to prove she deserved to be there.

"Good. I'll have the files from my office transferred. She'll get all evidence, all witness statements, everything," the ADA turned towards the new Detective. "We need something. Some connection. You'll understand when you get the files."

Barba stood, walking out of the office.

"What's this case about exactly?" Y/N asked.

"We've got a serial rapist that we know is guilty of five rape-murders. There is one witness who he tried to attack, but she was trained in martial arts and escaped. Reported it to the police. There's DNA evidence from her attack, but the techs can't find any DNA from the rape cases, and he supposedly has an alibi for the nights of the attacks. We know he did it, we're just missing the DNA.

"Can I have access to the physical evidence?" Y/N asked.

"Whatever you need," the Lieutenant agreed.

As the Detective turned to leave the office, Olivia spoke one more time.

"Welcome to SVU."