AN: I'm glad to see that I have people interested in my story. Some chapters are going to be longer than others, depending on how much detail I need to add. Kathleen's/Kathie's character I thought that she might look like Erica Durance a bit, just minus her eyes, if you wanted to know how to envision Kathie. If I have a certain look in mind for a character I'll let you know in the author notes when I introduce the character. I hope you are all enjoying the story so far.

Ch2

Kate leaned back in her leather office chair as she held her now second cup of coffee in one hand. The slow day was not helping her forget about her sister and her dream. She looked at the picture on her desk of her and her sister when they were younger. She was 9 and Kathleen was 6. Whenever someone asked she just said it was her best friend and her when they were kids. She was not lying, her sister was her best friend...minus Castle, but she wouldn't admit that.

Besides Castle's books helping her get over her mother's murder, which she'd never tell him...for now anyways, her sister was the one that helped her the most. Kate was now her role model. Kate was the one she'd call at night when she had a nightmare and she needed her sister to comfort her. She would get into Kathie's bed and read to her a part of Castle's book or a story that came into her mind until Kathie fell asleep. Some nights she would stay there and sleep in her bed with her to bring them both comfort that they had lost when their mother died. Even though their mother's death was tragic it brought them closer together.

They were always close since the day that Kate saw Kathie through the window of the nursery and each day they became closer. From the first time Kate held her little sister, with her father's help of course, to the time Kathie went away to college.

Even during Kate's wild child phase she always made sure she was home before one in the morning to make sure her sister did not need her. Her sister wasn't too much younger than she was, they were three years apart, so it was not like Kate was taking care of a child. Kathie just liked to know that someone out there cared for her, someone that loved her, and someone that would always be there to protect her no matter how old she was. Kate needed to know that too.

When Kathie went to college off to Florida Kate took it hard. She was just about done with the academy and the one thing she looked forward to when she came home after a long day was sister bonding time. It could of just been a movie night or just talking a few hours about their day. She did not like her sister being more than a few miles away. She could not protect her and that's when she started to push her out of her life. The phone calls went from every day to once a week, then to once a month, and then to just birthday calls or when something in their life happened that they just needed to let the other one know.

Even though they were distant they were still close. Granted that they didn't snuggle up in front of the T.V like they used to but they were still sisters and Kate felt what she was doing was right. If she knew her sister was safe because she wasn't around her then it was a price she had to pay.

She was knocked out of her thoughts by Castle saying her name, a bit louder than usual, and shaking her a bit. She was guessing that he had tried to snap her out of her thoughts multiple times and she wasn't responding to him. She looked at his hands on her shoulder's and felt something she always felt when he touched her, love. Her therapist was right, she was in love with him. She could not admit that though, especially now with these nightmares and the wall that was still there. She looked at Castle, looking into his eyes and giving him a what look.

"Don't give me that look Katherine Beckett. Something's wrong. You have been looking at that picture at your desk for a least five minutes and have only taken one sip of your coffee. This isn't you. What's wrong?"

"Nothing is wrong Castle. It's just a slow day and I guess I'm just zoning out. Lack of sleep probably". She hoped he would not push for more information.

"Day dreaming about me?" He said with a smirk, trying to bring humor into a situation that was clearly bothering her.

She gave him a look. "You wi..." She was cut off from what she was saying when she saw the woman walking into the bull pen. She had long, curly, brown hair, a little longer than Kate's. Her blue eyes looked liked crystals the way the sun was shinning in through the building and her lips had a slight pink gloss over them. She was wearing black high heels, blue jeans, and a pink button down work shirt.

Kate couldn't believe what she was seeing. It couldn't be her...no. "Kathleen?" Her name escaped her lips in a whisper. Castle, Ryan, and Esposito looked in the direction of where Beckett was looking to see what had caught their friend so shocked.

Kathleen turned the corner where she was in full view. She looked at Kate and gave her a bright smile. "Hey, Kate" She said in a low voice, not sure how her sister was going to react to her surprise visit.

Kate quickly got out of her chair when she heard her voice. She wasn't dreaming and her sister was really in front of her. She ran over to her and embraced her in a tight hug, which caught everyone by surprised. It took a moment for Kathleen to register that her sister wasn't mad and she knew from the way she hugged her something was wrong. After all this time she always knew when her sister wasn't herself. She wrapped her arms around her sister and they just stayed like that for a moment until they heard Castle cough, wanting to obviously know who this woman was that made Kate drop everything and hug her.

Kate pulled away from her sister and gave him a look. "Do you mind? You can save your time hitting on her. She is not going to date you and will not fall for this so called charm you think you have".

"And how do you know that?"

"Because she's my sister, Kathleen or Kathie" Kate smirked as she wrapped her arm around her sister's shoulder.

Castle gave them both a shocked look. "Sis...sister? And we're just finding this out now? I could of found her earlier to get these stories you won't share with me!"

Kathleen smiled and Kate rolled her eyes. "Well that's probably the exact reason Kate didn't tell you about me. But don't feel left out...not a lot of people in Kate's life know about me".

Castle looked at Ryan and Esposito. "Did you know about her?"

They both shock their heads. "No", they said in unison.

Kathleen looked over in their direction and gave them both a small smile before looking back at Castle. "See, Katie hides me from everybody".

Kate rolled her eyes at the Katie nickname and removed her arm from around her sister. "You make it sound like I locked you up in the basement and you're just seeing the light of day for the first time".

"You know that could make an interesting story..."

"Oh, so you're writer boy that I've heard so much about".

Castle couldn't hide the wide grin that was spreading across his face when Kathleen said that. "Writer boy? Is that your nickname you use for me when you two talk?"

She gave him one of her famous back off looks and Kathleen just smirked. Castle zipped his mouth and sat back down in his chair to drink his coffee. "Well it looks like the famous Kate Beckett glare still works" Kathleen smirked again as she looked at her sister.

Kate smiled softly but then as she looked her sister in the eyes she saw a flash of her nightmare from the night before. She shook that away and gave her another soft smile. "What are you doing here? I thought you were still visiting dad".

"Well now that I've been done with college for about a year now and I have a job in the city again, I think it's time we had our sister bonding time back and I figured a surprise visit was the first thing on the agenda" She smiled, which Kate returned.

"I get out of work at 7" She headed into her bag and took out her key to her apartment. "Drop your things off and make yourself at home. I'll bring the Chinese food for dinner".

Kathleen was about to open her mouth to say something when Gates exited her office, heading towards them. "Detective Beckett, I keep Castle around because he has shown to be useful but bringing more civilians in will not be accepted".

Kathleen and Kate both looked at Gates. "Well I think you could make an exception for my sister, sir"

"Sister? Another detective perhaps?"

Kathleen shook her head. "No, I teach high school English. The closest I get to dealing with murder is when we're acting out a Shakespearean tragedy" She smiled softly.

"Well no offense..." Gates stopped not getting her name.

"Kathleen or Kathie. Whatever one you prefer".

"No offense Kathleen but Detective Beckett already has enough distractions at work" She looked over to Castle and Kate rolled her eyes. "So if you don't mind having this family reunion when she gets out of work it would be much appreciated. Oh and Detective Beckett, you're staying later tonight, If I knew your sister was in town I wouldn't of changed it but a family emergency came up for one of the other detectives".

Kate sighed. She needed time alone with her sister to get these nightmares and these thoughts of her dying with every step that she took. "Yes, sir" Gates headed back into her office and Kate looked over to Kathleen. "We'll spend the day together tomorrow, Kathie. I'll call in sick" Kate said in a whisper as a smirk graced her face. She never called in sick, but her sister was worth it.

Kathleen smiled. "Don't worry about it sis. We have all the time in the world. Have fun with writer boy". She winked, which caused Kate to roll her eyes and Castle smile. "But if you don't mind I am going to steal some of your coffee. Starbucks is too far away and that looks like a fancy espresso machine. Looks like working with him has it's perks" Kathie smirked as she turned to head into the break room.

Kate and Castle were now both smiling. "I told you that was a good investment" Castle smiled as Kate rolled her eyes before taking a sip of his coffee.