Chapter 1 - "Please."

"So what've we got?" Beckett and Castle were side by side, standing in front a dead body, Lanie was lowered next to it, her hands traveling through the blood and the bones, trying to figure out causes, but as soon as she heard Beckett's voice, she looked up to both of them.

"Claire Lott, 15 years old, time of death between 8 and 10pm." Lanie sighed slightly. "She was shot right in the heart, died immediately."

"She was… 15?" Castle opened his eyes a little, and then looked down to his feet, imagining that the girl could have been Alexis. This cases were always difficult to him.

"Yes, writer boy, you heard it well." Lanie frowned her eyebrow.

"Why would someone want to kill such a young girl?" he asked, looking at Lanie again, his eyes didn't need to travel much to get to her.

"That's what we need to find out." Beckett smiled lightly, knowing what was going on Castle's head. That was their thing - they always knew and understood each other. "Anyone heard the shot?"

"No. Someone saw it." Esposito walked behind them, and stood next to Beckett.

"What do you mean?" Beckett was quite surprised by that, since they weren't used to having witnesses. Not to that kind of murder.

"Mary Fillion. Also 15 years old. Apparently, the house is her aunt's. She lives here with her." he completed.

"Where is she right now?" Castle asked, interrupting Beckett, that was about to ask the same thing.

"She locked herself in her room. All we can hear are cries. She's scared. We've yelled, she doesn't open the door. We've called someone to open the door for us, someone that can get us a key. We don't want to scare her even more by kicking it."

"Well of course she's scared! She saw a friend die in her own house, for God's sake. I'll talk with her."

Beckett took a deep breath, and with Esposito's help, she got to the door, placing her ear next to it. It was normal for a 15 year old to be shocked with such thing. She knew what she was going through wasn't easy. A sigh escaped from her lips before she started talking.

"Mary?" she started, yelling. "Detective Kate Beckett here," she added, shouting a look at Esposito as she heard the girl cry. "I need you to open this door for me, okay? I know you're scared, but we can help you."

"Come on', just open the door." Esposito tried to complete her. No, that was Castle's thing. It wouldn't work with him.

"Mary, listen to me. I know what you're going through isn't easy. But I swear we can help you. I will help you. Please, open this door. I promise everything's going to be alright."

She completed her speech, now she hoped the young girl would open the door. That was all she could do. She really wanted to help this girl. She knew the pain.

Suddenly she saw the young girl opening the door; a small smile appeared on Beckett's lips, realizing she had convinced her. Esposito approached the young girl, grabbing her arm, not with too much strength so he wouldn't hurt her. He slowly walked her out of the house and leaded her into the police car, trying to be careful with her, treat her well, as Beckett walked towards Castle again, without looking back. She was deeply worried about this girl for some reason. Castle was trying to help Lanie but all he could do was staring like a madman and shout his crazy theories, something that Lanie didn't appreciate that much.

"Oh thank God," Lanie got up as she saw Beckett approaching. "Take this man out of here, please." she pushed Castle towards the brunette.

"I will miss you too." he shouted as him and his partner walked out of the house and headed to the precinct.

"Let's go, Castle." she shouted a smile, and then he opened the interrogation room's door for her, as she thanked him, almost whispering. They walked towards the table, Mary sitting on a chair next to it, tears rolling down her face, lots of them coming quickly without warnings. They both sat on chairs, right in front of the 15 year old girl. It was time for some questions, even though they knew it wasn't going to be easy.

"I'm sorry you're in here," Castle smiled lightly. "But it's for security. You're not a suspect or anything like that." he said, making sure she knew she wasn't. He wanted to keep her calm, but her heart started beating faster, tears coming down stronger. It was a reminder her friend was dead.

"We're here to help you, Mary. I promise we'll do our best to catch the guy. But we also need your help, okay?" Beckett looked into the girl's eyes as she looked up.

"Okay." Finally someone was able to make the girl talk. First time they had actually heard her voice. She hadn't talked since she was out of the room.

"I'm going to ask you a few questions, is that alright?"

"Yes." she mumbled as she tried to wipe her tears away.

"You live with your aunt. Why?" Beckett asked as she interlaced her fingers, placing her hands on the table.

"My parents died exactly one year ago. It was a robbery gone wrong. At least that's what they said. I don't believe it much." she looked down, tears streaming down her face again, but she tried to keep them to herself, so she wouldn't look like a complete mess in front of her... well, idol. This young girl had a passion for Rick Castle - not only he was her favorite writer, he was also very charming and some kind of writer role model for her.

"I'm really sorry about that," Beckett said, her hand travelling through the table, letting it open right next to hers, so she'd hold it. A light smile appeared on Mary's lips and she took Beckett's hand, thankful for her action. "What did you see?" she asked, holding her hand with all her strength, now going deeper.

"She said she needed to go to the bathroom. I turned on the radio and sat on the sofa as I read… uh... Naked Heat." she shouted a look to Castle and smiled shyly, then continued. "I heard her scream and then I ran towards the bathroom. In a few moments I had a gun pointed at my head and he started stepping back. He jumped out of the window, and when I looked at her… she was dead." she let Beckett's hand go, and placed both of her hands in her head. "I could have stopped him from running away."

"You had a gun pointed at your head," she pointed out.

"You did what everyone would do. You can't blame yourself." Castle said, looking at Beckett.

"I think we have enough for now." Beckett smiled. "Detectives Ryan and Esposito will lead you to another room where you'll stay until we catch the guy."

"I'm scared." she admitted as she grabbed Beckett's hand again when she was about to get up, a tear falling right on it.

"I promise you'll be safe." she rubbed Mary's hand as she looked at Castle and nodded, then let it go and got up, walking out of the interrogation room, Castle once again, opening the door for her, like the gentleman he was.

Notes: I know it's not a big thing, but I wanted to keep Chapter One quite short so people would understand what happened here. I will post the next chapter (which will have Caskett cute moments) as soon as I get enough reviews to improve my writing and keep my imagination going. I have lots of sweet moments coming up, and just so you know, Mary will be part of a couple of them. Review please! :)