They pulled up to the quaint little apartment. Booth wondered how anything could have happened to Carly. This neighborhood looked like the one whose neighbors knew everything that was going on. He made a mental note to talk to some of the neighbors for a lead.

He stepped out of the car, Brennan following wordlessly behind him. She was wondering if they were going to get shot at. But it didn't seem plausible; the neighborhood was too…friendly for that kind of violence. But then again, looks could very well be deceiving.

Booth tried the doorknob, finding it unlocked, which could be a very bad sign. He drew his gun. "Bones, stay behind me."

He advanced forward, keeping his gun at eye level, finger itching to shoot. Booth scanned all the rooms, which didn't take long since it was such a small house. Finding it clear, he put his gun away and motioned to Bones that she could do her thing.

"The door was unlocked," he told her, trying to fill the silence and making his way around the house himself, looking for the telltale signs of a break-in gone wrong.

But that wouldn't make sense, since the door was unlocked.

"I gathered," Brennan said, absorbed in her examination. She recalled that there had been a deep nick on the C5 rib and she was categorizing the things in the apartment into possible weapons. She would have to look at the bones once more to get a true feel of the shape of the wound, but there was no harm in looking now.

"I was thinking maybe it was a break-in, but since the door was unlocked, it might have meant that someone had a key," Booth speculated.

"Or she just left her door unlocked," Brennan pointed out. Booth rolled his eyes; she always had to poke holes in his theories.

They searched the house for a few minutes more. "Well, this seems like a waste of time," Booth snapped in frustration. "I think we should just go talk to the neighbors. Maybe they saw something."

"Wait a minute…" Brennan said slowly. She walked up to the small fireplace. On the mantel were a few pictures in silver frames. One was of Carly and who she assumed was Andrew, her ex-boyfriend, because they were kissing. The next was of Carly and her parents. But the last one didn't make sense.

It was Carly and her mom, but it wasn't her husband standing next to her. It was a boy, about Carly's age in the picture. Robert and Sue Matthews hadn't mentioned any other kids.

"Booth, look at this."

Booth didn't think there was anything significant about a family photo, but upon closer inspection, he saw that there was a guy in the picture that they didn't recognize.

"The bone structure between the three of them is oddly similar," Brennan told him.

"What are you getting at, Bones?" he asked her, removing the photo from the mantel. It was slightly dusty on the glass.

"I'm getting at," Brennan said, copying Booth's wording which was so unlike her own, "Mrs. Matthews may have been having an affair quite some time ago."

"A step brother," Booth said thoughtfully. "Yeah, I can see the resemblance."

"The problem is that now we have plenty more people with motive for murder," Brennan pointed out.

"And the finger points at Robert Matthews," Booth finished, looking at her. "Good call, Bones."

She smirked. "Those are the fact's Booth."

He chuckled. "Now let's talk to some of the neighbors and see if they know anything."

Booth knocked on the burgundy colored door. It was the third house they had been to and none of the other ones had anything other than the basic information that they already knew. He didn't expect this house to be any different.

The door creaked open and an older woman appeared. She had glasses slipping down her nose and she walked with a cane.

"Well, hello there. What can I do for you?" she asked sweetly, squinting up at them.

"Hello, ma'am, FBI," Booth said as a standard greeting. "Do you mind if we come inside and ask you some questions about the woman who lived across the street?" He pointed over to the house.

"About cute little Carly? Sure, you can ask me all the questions you want," the old woman stepped creakily back and allowed them to come in.

The house was small, but cozy. The woman was making her way to the kitchen, back hunched. "Let me get you something to drink, dear."

Booth smiled at the woman's retreating form. Then he turned to Bones, who was behind him. She had her nose scrunched up in disgust.

"What's wrong?" Booth asked her, stepping closer.

"I don't like the smell of old people," she said, breathing in and sneezing. She rubbed at her nose furiously.

Booth barely stopped himself from laughing out loud and he ignored Bones' glare. "You're telling me that you deal with the smell of rotting bodies all day and you can't stand the smell of old people?" he asked her incredulously.

She sniffed, and breathed through her mouth to stop the smell from penetrating her nostrils. "Yes," she answered. "I don't see why that's funny."

Booth kept on laughing to himself, and he patted Bones on the back lightly.

The old woman came back, holding two glasses on a tray. It looked wobbly, so Booth rushed over and relieved the tray from her grasp.

"Thanks, dear." The woman took a seat and gestured for Booth and Brennan to do the same. "So what can I do for you?" she asked, pushing her glasses up the bridge of her nose. It made her eyes appear wider.

"Well, can I first ask you your name?" Booth asked, taking out a notepad.

"Margret Flouter, but you can call me Marge," she answered, leaning her cane against the chair. She was short and her legs dangled over the edge of the chair, reminding him of Parker when he sat on a park bench.

"So what can you tell me about Carly Matthews?" Booth asked, getting down to business.

"Carly was so sweet; she helped me with a lot of things around the house. Whenever I asked her, she came right over, no matter what. She even brings me dinner plates sometimes. I live by myself so I take all the help I can get," Marge stopped, thinking. "I remember that one time, my cat Snickers got loose and she tracked him down for me. Stopped him from getting hit by a car if I remember correctly."

Booth looked at Brennan. Why did murder always happen to the nice people?

"She sounds very nice," Booth agreed. "Do you know if she lived with anyone there, or was it just her?"

Marge brought a hand to her face thoughtfully. "Well, I think she lived by herself. But a lot of the time, I would see a man come over. Looked about her age, too. I always figured he was her boyfriend, but she never mentioned anything like that to me."

Booth clutched the pen tightly; now they were getting somewhere. "Do you remember what the man looked like, Ms. Flouter?"

"Please, call me Marge. Now let's see…I never really got a good look, but he had long sandy colored hair, you know? I never saw the front of him though."

Brennan tapped Booth on the shoulder and leaned forward to whisper in his ear, "The boy in the picture on the fireplace had long sandy-colored hair."

Booth nodded imperceptibly. "Anything else you remember, Marge? Anything at all could be helpful," Booth said, trying to dig up some more information.

"Well, one night, I heard a crash. When I went to the window, I saw police cars outside. Carly never did say what that was about…" Marge said distractedly. "Why are you asking all these questions, son?"

Booth cleared his throat and stuck the notepad back in his suit. "Carly Matthews was murdered. We are investigating what happened. Thank you for all your help, Marge."

Marge's mouth was hanging open. "Who could have done this to Carly? Who would want to kill such a sweet girl?"

"That's what we are trying to find out."

Booth and Brennan were talking avidly as they drove to the lab. Brennan wanted to look at the bones again. She wanted to find clear cause of death.

Booth wanted to go back to the FBI building to call in Mrs. Matthews for questioning. He figured she had an affair and the kid in the picture was her son. He wondered if the dad knew about the affair; it would have taken place a long time ago.

"All we got from that old lady was that Carly was in contact with the alleged step brother. I don't see how that helps us," Brennan said.

"I don't get how all of this ties in to the bar exploding," Booth said, pulling to a stop at a red light, lost in his own thoughts. He ignored Brennan's statement altogether.

Brennan for a change remained silent, not sure what the bar exploding had to do with the case either. She saw a couple of possibilities, but she wouldn't know anything for sure until one of the people on her team found something.

"I think we should go talk to the ex-boyfriend. I bet you he knows something," Brennan said, channeling her inner FBI.

Booth chuckled. "Sure, we can check out the ex, but not until tomorrow. It's getting late and we still need to figure out who the guy in the picture is. I say we call in Sue Matthews."

Brennan pulled out something from her bag. "I'm going to give this picture to Angela and ask her to find out the name of the step-brother, if that's okay."

Booth's eyes darted over to what Brennan held in her hand. "Bones! You can't just take things from people's houses. Especially dead people's houses. I thought we have gone over this before."

"Why not? It's pertinent to the case, and it's not like she's going to miss the picture. She's dead," Brennan pointed out blatantly.

Booth sighed, not bothering to explain, as they pulled up to the FBI building.

"Hey, I thought you were bringing me to the Jeffersonian," Brennan protested as Booth opened up her door for her.

"I need you and Sweets here to interrogate Carly's mother. Besides, your squints will call you if they find anything important, right?" Booth made his way up the path into the building, keeping a hand lightly on Brennan's back.

"I suppose," she answered back grudgingly. "I thought you said it was getting late."

"I meant that talking to Sue Matthews is more important than talking to the ex-boyfriend right now. Don't worry, we will talk to him too, I just want to talk to Sue first." Booth said, noticing the look Bones gave him.

They hurried off to go find Sweets and call in Sue Matthews. Hopefully, she would provide a lead in this case.

Sue sat in the interrogation room, blowing her nose loudly into a tissue. Brennan, Sweets, and Booth were gathered in a separate room, watching her through the one way mirror. They were quickly discussing the details they had found before Booth went in to question her.

"I'm just going to get out of her that she had an affair and a son. I want to find out who the affair was with, how long ago, and if her husband knew about it," Booth told Sweets, who was studying Sue thoughtfully.

"I'm not sure how much you can get out of her. She is obviously still distraught about her daughter's murder. I don't think that she had anything to do with the murder," Sweets said, turning back to Booth.

"Thank you Detective Sweets," Booth said sarcastically. With a last look at the two of them, Booth stepped outside the room and into the room that held Sue. Booth stuck in the little headphone in his ear so he could hear what Brennan and Sweets were saying.

"Hello, Agent Booth," Sue said, crumpling another tissue in her hand. "Did you find any more news on Carly?"

"Actually, Mrs. Matthews, I want to ask you some questions," Booth said, setting a folder down on the table and sitting down across from her.

Sue looked confused for a second, but then her red rimmed eyes narrowed. "You can't think I would have had anything to do with this?" she asked, appalled.

"Maybe not directly," Booth said, causing Sue to look up at him in surprise.

"What do you mean?" she asked shakily.

Booth reached into the file he had and pulled out a copy of the picture that Brennan had taken from Carly's house.

"Can you please tell me who is in this picture?" Booth asked, sliding the picture in front of her.

Sue picked up the picture and inspected it, trying to keep the surprise off her face, but Sweets picked up on it.

"She recognizes who it is," Sweets supplied helpfully to Booth through the microphone. Booth nodded slightly to indicate that he agreed with Sweets.

Sue put the picture back down on the table, fresh new tears springing to her eyes. "Where did you get that?" she asked in a low voice.

"Don't push too hard, Booth, or she will shut down," Sweets told him.

"I don't think that's important, Sue. What's important is that you tell me who is in that picture," Booth said, gently.

Sue rubbed at her eyes and remained silent for a minute. She took back the picture. "That's Mark, my son."

Bingo.

"I'm assuming that this isn't your son with your husband, Robert is it?" Booth asked. "Because if it were, then he would be in the picture."

"Yes, I had an affair. But it was a long time ago. Why does this even matter?" Sue asked.

Brennan's phone rang, echoing in Booth's ear. He stood up and glared up in the direction of the two of them. Brennan fumbled around until she got her phone.

"Dr. Brennan speaking."

"Hey, Dr. B, it's Hodgins. You should get back to the lab ASAP." Brennan could hear the excitement in his voice.

"Thank you Hodgins, I'll be there soon." She snapped her phone shut and tuned back into the conversation.

"Your husband didn't know about the affair, Mrs. Matthews, correct?" Booth said.

She gave a slight nod. "No, I never told him."

"Your daughter obviously knew about the affair," Booth said, gesturing towards the picture. "I think you know what I'm thinking," Booth said, placing his palms on the desk.

Sue's mouth flung open in surprise. "Oh my God, no. Robbie would never do anything to hurt our daughter. No matter what happened. He loved her so much. I can't believe you would say something like that," Sue said, face contorted with anger.

"One more question. Mrs. Matthews, who was the person you were having an affair with?"

Sue shifted uncomfortably in her chair. "Is this really going to help the case?"

Booth raised his eyebrows in answer.

Sue sighed, placing her hand to her forehead. "Jerry White."