Rossi and Hotch headed pulled into the driveway. They had been in town for a few days hunting down this killer and now they were worried that he had struck again. The Diara's were all worried because their daughter, Sandra, had been taken just that night. Sandra's friends were gathered outside talking in hushed voices. All their faces showed concern except for once who showed no emotion at all. Rossi followed Hotch into the house. The saw the family in the living room. There was the parents, Santaria and Marden, the son, Matt, and Sandra's boyfriend, Kyoya. Rossi stopped for a moment when he saw Santaria. Hotch noticed his pause and turned to face him.

"You ok, Dave?" Hotch asked.

"Santaria, we used to date," Rossi answered, motioning toward the mother. Hotch glanced at her and turned back to Rossi. Rossi just shook his thoughts away. "I'll be fine. Let's go."

Hotch nodded and they headed into the living room. Santaria instantly recognized Rossi and tried not to make eye contact. Kyoya had a hard gaze fixed on them. "I'm SSA Aaron Hotchner, and this is SSA…"

"David Rossi," Santaria finished for Hotch. "Been a while."

Rossi just nodded. "I'm sorry that your daughter was taken, but we need to ask you some questions."

"Did act suspicious around Sandra lately?" Hotch asked.

"Not that I know of, but she's only been back a day," Marden answered. "She doesn't live here full-time anymore."

"Where does she live?" Rossi asked.

"In Japan," Kyoya answered this time. Rossi met his eyes and saw determination in his eyes. If we don't catch this guy, Kyoya will take matters into his own hands.

"Did you hear anything unusual last night?" Hotch asked.

"No, nothing. My husband and I were talking in our bedroom when Matt came in and told us that Sandra was missing. Kyoya and Matt checked the woods but there was no sign of her," Santaria answered.

"Did you have the doors locked last night?" Rossi asked.

"Yes, we always lock them when we go to sleep or when we're not here," Marden answered.

"But there was no sign of a forced entry. I already checked," Kyoya added, grimly.

"If only she had stayed up in her room. Maybe none of this would've happened," Santaria rasped.

"There was nothing you could've done. The unsub probably would've just gone upstairs and got her and possibly got the rest of them too," Rossi argued. "This is not your fault."

Santaria met his eyes and nodded. "David, I need to talk to you in private before you leave, please."

Rossi glanced at Hotch and nodded. "Give us a minute." Hotch nodded and he left the room with the others. Rossi waited until it was just him and Santaria in the room. "What is it?"

"There's a secret that Sandra and Matt don't know. Marden and I have been trying to figure out how to tell them, but we just don't know how. Sandra and Matt aren't Marden's," Santaria began.

Rossi's eyes widened as he saw where this conversation was going, but he asked the question anyway. "Then, whose are they?"

"They're yours," Santaria answered, looking into his eyes. "I would've told you, but you were long gone, and Marden agreed to raise them as his own. He loves them just as much as he would his own kids."

Rossi sat in silence, letting what he just heard sink in. He had kids he never knew about? This just made finding Sandra even more important. I've got to find her before that monster kills her.

"Mom?" Rossi turned around to see Matt watching them.

"Matt," Santaria stood up and stared at her son. "Did you hear all that?" Matt nodded. "I'm so sorry for not telling you sooner, son. I just didn't know how."

"It's ok. I understand. You had the best intentions in mind," Matt said, smiling in spite of his grief. He looked at Rossi. "You're going to find her, aren't you?"

Rossi blinked, staring at his newly found son. He nodded. "I will find her, no matter what it takes."

Matt nodded, looking down at the ground. Rossi nodded reassuringly to Santaria before heading toward the door where Hotch was waiting for him. He stopped in surprise when he felt someone hug him from behind. He looked and saw Matt. "Thank you!"

Rossi smiled at him and hugged him back. "Nothing will happen to your sister. I promise that I will bring her right back here."

Matt nodded, letting him go. He returned to his mom's side. Rossi watched as the family disappeared inside their house. Rossi then turned and walked back to the SUV with Hotch. When they got in, Hotch looked at him. "What was that all about?"

"What do you mean?" Rossi countered.

"What did Santaria tell you?" Hotch asked.

Rossi shook his head and just stared out the window. "I'll tell you later, Aaron."

Hotch stared at him for a moment before starting the car and driving back to the office where the rest of the team was waiting. They met in the conference room.

"How's the family?" Morgan asked.

"Holding up," Hotch answered. "Sandra's boyfriend is pretty mad. What do we have so far?"

"All the victims are around the age of 16," Blake began. "They were all killed in their homes. The killer forced his way into each home when everyone was asleep and couldn't hear him. He then would kill the victim and run out."

"It almost looks like there are two separate groups of victims. All the boys look the same and so do all the girls. Same hair, same eyes. The only thing that connects the boys and the girls is that all of them are twins," Reid explained. He pulled up the boys' and girls' pictures.

Rossi narrowed his eyes. "The boys look a lot like Matt, and the girls look like Sandra."

"Is it just a coincidence that they look like the victims and are twins?" JJ asked.

"That's not all that's odd about this. Sandra wasn't found dead at her house. She was kidnapped, and there was no forced entry. The door had been wide open and nothing was broken," Hotch said.

"A different unsub?" Morgan suggested.

"No, it's the same unsub," Hotch replied. "I think Sandra and Matt were the intended targets all along. Or at least, one was."

"Sandra does live in Japan now. Perhaps when the killer found out he couldn't get her he had to substitute those other girls," Rossi suggested.

"And when Sandra got back, he got his chance," Hotch finished. "And with no sign of a forced entry, that would have to mean the family knew this guy. He would have to be a close relative, somebody with a key. I doubt anybody could pick that lock without alerting the family."

Morgan called Garcia. "What do you need?" Garcia asked in an upbeat voice.

"Garcia, pull up all the family members outside the Diara household," Hotch ordered.

"Ok, that's quite a list. Give me anything to narrow it down?" Garcia asked.

"Which one's live in the area?" Morgan asked.

"Still a big list," Garica answered after some typing.

"Any with a criminal record?" Blake asked.

After more typing, Garcia said, "None. All clean as a whistle."

"Keep the list of the family members up. We'll figure out some way to narrow it down," Hotch said.

"Thanks Baby Girl," Morgan said before hanging up the phone.

"This guy is going to be hard to find," Blake commented.

The rest started tossing idea around but Rossi wasn't listening. A family member would have to be pretty mad to kidnap someone in their own family. Unless, they weren't their family at all.

Rossi got up and left the room, making everybody stop what they were doing and watch him. He pulled out his phone and was about to call Santaria when Hotch joined him. "What's going on, Dave?" Rossi didn't say anything, or look at Hotch. "Dave, come on. You know something that could be crucial to finding Sandra and her captor."

Rossi looked at him and sighed. "Santaria told me something back at the house once you and the other three had left us alone. Marden isn't the true father of Sandra and Matt."

"Who is?" Hotch asked.

"I am," Rossi answered. "Nobody would want to hurt somebody in their own family unless they weren't family at all. It has to be somebody on Marden's side of the family that found out that Sandra and Matt weren't actually Marden's kids."

Hotch nodded. "I tell Garcia to narrow the search down to Marden's side of the family. And Dave?" He paused a moment to make sure Rossi looked him straight in the eyes. "We'll find her." Rossi just nodded and Hotch headed back into the conference room while Rossi called Santaria.

"David? What is it?" Santaria asked once she had picked up the phone.

"May I speak to Marden? Please, it's important," Rossi begged.

There was a slight shifting sound on the other end of the line before, "Agent Rossi, have you found her yet?"

"No, but we might be getting close. Tell me, did anybody on your side of the family know that Sandra and Matt weren't yours?" Rossi questioned.

"Yeah, all of them know," Marden answered.

"Did anybody seem angry about it, or refused to believe it?" Rossi pressed.

"Well, my brother Malvin kept saying I was lying, but he's the only one," Marden replied.

"Does he live in town?" Rossi asked.

"Yeah," Marden answered. "You don't think he…"

"I don't know. Thank you," Rossi hung up the phone and headed back into the conference room. "Marden said that his brother Malvin wasn't too happy when he found out." Hotch nodded.

"Found out what?" JJ asked. Rossi could see the whole team looked confused. Hotch didn't tell them.

"Sandra and Matt aren't Marden's," Hotch said. He glanced at Rossi and nodded, saying he wouldn't tell them unless Rossi wanted to. Rossi kept his mouth shut, not wanting to tell them just yet.

"Garcia, we need an address for Marden's brother Malvin," Morgan said.

"Got it. Sending it to you now," Garcia replied.

"Good work, Garcia," Hotch ended the call and they all headed out.

Please R&R :)