Sara Sidle groaned as she dragged her tired body through the halls of the crime lab. It had been a long day. All she felt like doing was going home and curling up on the sofa. Maybe watch a little TV. It was no mistake, she loved her job, but sometimes… she felt like she needed a break. Catherine and herself were working a different case than Nick and Greg. They were trying to catch a serial rapist. He had claimed five victims already. Three of them were dead. Now she had to piece together all the evidence they collected from the three crime scenes and try to find this guy. There wasn't even a known suspect yet.

"Grissom," she muttered bitterly as she turned into the DNA lab. The new technician, Mia, wasn't working tonight. Instead, she had a replacement, Helen McGregor, standing in. Helen was a friendly young woman who was good at what she did. She stood about Sara's height and had long, blonde hair and piercing green eyes. With a faint smile, Sara leaned against the door and looked to her co-worker. "Any hits on that DNA we retrieved from the victims?" she asked. Helen nodded and handed Sara two sheets of paper.

"You have two donors. Three of the girls had both DNA inside of them and the other two had just one," she explained. "Which three?"

"Your DB's." Sara took in a deep breath.

"So… our vics all have one guy in common… And three of them have two guys in common… I don't quite understand where this is going. Did you run the DNA through CODIS?" she asked. Helen nodded.

"I was just getting to that. One of your guys came up. The guy who was with all five." Sara studied the familiar face on the screen. Davis Lattenberg. That was the man Warrick was after. She smiled and Helen and took off.

"I gotta tell Warrick and Catherine." She headed quickly down the hall. In the coffee room, Warrick and Catherine were laughing at something in a magazine. "Is it just me, or am I the only one doing my job tonight?" she asked as she entered the room. The two CSI's stopped and looked to her.

"I was just waiting for you," Catherine said as she straightened her back. Sara wrinkled her nose and handed the sheets of paper to her partner then looked to Warrick.

"Looks like were working the same case." Warrick leaned over Catherine's shoulder.

"Let me see that," he demanded playfully. Catherine handed it to him and looked up to Sara. "Davis Lattenberg, eh? Well, What about the other donor?" Sara shook her head.

"No hits, but Helen's working on it." Catherine groaned. Sara rolled her eyes. She was tired and wanted to lay down on the couch for a nap. As the thought was becoming more and more tempting, Helen burst through the doors with a big smile.

"I got something on your other donor!" she exclaimed excitedly. Startled, Sara jumped to her feet and tried to catch her breath, She caught her co-workers snickering.

"What is it?" Catherine asked. "Is it any link to our previous suspects?" Helen shook her head.

"No, but it does have thirteen alleles in common with Davis Lattenberg. How I didn't catch that before is far beyond me. But I decided to runt hem against each other, and boom!" she smiled and handed the sheet of paper to Catherine. Turning around, she waved and stepped out of the room.

"Good luck!" she called before disappearing down the hall.

"I didn't even know Davis Lattenberg had a brother," Warrick said as he took the sheet from Catherine. Sara peeked over his shoulder and noticed there was a name and address attached.

"Let's go bring this guy in," she said as she headed hastily for the door. Catherine and Warrick followed her. She paused when she noticed Grissom step around the corner and into his office. There was a petite, dark haired woman with him who had to be no older than twenty five. They were smiling and laughing. As Sara took in a deep breath, she felt a pang of jealousy in the pit of her stomach. Catherine faced her partner and waved her over.

"Come on Sara. Let's get this guy before he realizes we're out to get him." Nodding, Sara looked away from Grissom's office and began walking toward the exit. While she walked, Greg flung through the double doors and stormed down the hall. He appeared to be muttering useless threats beneath his breath. She took in a breath to holler to him, but Catherine stopped her.

"None of our business, now let's go."

Angry, frustrated and tired, all Greg could think about was how upset he was. The thought of Candi leaving wasn't the hard part, it was dealing with the reasons why. He headed right for Grissom's office to state his mind. When he arrived, the door was shut and laughter was coming from inside. Rage flew through his veins as he contemplated how his boss could be so happy after what happened tonight. Rarely did Grissom laugh like that, and after what he did that evening, he shouldn't be laughing. Grabbing the door handle, Greg flung the door open and stared at his unusually happy boss. The man wasn't alone, obviously. He was with a young woman who somewhat resembled Sara. Long straight hair framed her delicate young face and shimmering green eyes were filled with pride and hope.

"Greg," Grissom greeted casually. "What can I do for you?" Greg stared at him in disbelief.

"What can you do for me? What can you do for me?" he asked angrily. "I just chased my girlfriend al over town in a failed attempt to get her to stay. All because of you! My car was towed and now I'm out a hundred bucks for a cab and another three hundred and fifty to get my car out! Assuming it won't be in the scrap heap by tomorrow!" Grissom's eyes went wide with surprise, then softened again.

"Sorry," he said, then he pointed to the girl across from him. "Greg, this is Natalie. She'll be a new CSI with us. And intern sort of but-" Greg cut him off.

"Sorry! You scare my girlfriend away and you're sorry? What kind of -" he was so frustrated that the words couldn't come out right. "Forget it!" he shouted. "I'm gonna go do my job. Something you don't seem to be doing very well at the moment." Leaving the office upset and unsatisfied, Greg slammed the door and headed out to find Nick.

The next day was long and Sara was getting frustrated. Catherine and Warrick were gone to bring in Davis Lattenberg. They found an address in the database so they were going to check it out. They tried the night before, but all they found was a ransacked apartment. An undercover cop gave them a tip on where he might be. Now all Sara could do was wait. She was analysing a scrap of a worn receipt when Grissom entered the room.

"Is Greg around?" he asked softly. She shook her head.

"Haven't seen him since last night." His gaze met hers. "He seemed pretty pissed. What happened between you guys?" Grissom shrugged.

"I need to talk to him. If you see him, beep me." Sara nodded and returned to her work. Another hour passed before Catherine and Warrick returned. Both of them looked angry.

"No luck?" Sara asked as she put her magnifying glass down. The two CSI's groaned.

"Nothing. He scoot before we even got there. It may sound shady, but I think that undercover cop is in on this whole thing." Her face lit up. "Warrick," she whipped around. "Run his DNA against our unknown sample," she ordered. He hesitated.

"But-"

"Do it. If you get in trouble, I'll cover for you." He nodded and headed out of the room. Grissom returned once more and motioned the girls out.

"I have someone I'd like you to meet." Sara groaned in displeasure as she followed her boss out of the examination room. Disgust filled her veins when she saw the pretty dark haired girl seated in the coffee room. "We have a new addition to our team." They tagged behind him as he entered the small, white room. Shortly after Warrick and Nick joined them, but no sign of Greg.

"Team," Grissom began as he pointed to the young girl. She was dressed in a black skirt and jacket with a white tank top underneath. That long, brown hair was tied back in a half ponytail. "This is our new member. She will be working with me and Nick on the Harper case." Sara rolled her eyes, trying to maintain herself.

"Uh-huh," Catherine muttered impatiently. "Can we go now?"

"Wait," he said patiently. "She was transferred here from San Francisco and has been added to our Night crew." Sara wrinkled her nose. Warrick extended his hand and shook hers.

"Warrick Brown, CSI 3. Pleasure to make your acquaintance. But I have a case I need to be working on. We can chat later." The girl nodded and Catherine introduced herself.

"Catherine Willows. As much as I would like to stay and talk, I have a case to lead and I need to be working on it. See you around." Sara's co-workers looked to her. With a groan, she shook the girl's hand.

"I'm Sara; and I'm going. Nice to meet you," she looked to Catherine and Warrick. "Let's get going." The girl let go of her hand and looked around nervously.

"Natalie," she said timidly. "Natalie Sidle."