Kathie had gotten changed into the undercover outfit for the night after writing her note for Castle and Kate. She then called up one of her friends who she knew worked at the sub shop a few blocks away. She handed him the note that she asked him to tape to Castle's order.

"Going on a date Kathie?" He said noticing her dress and curly brown hair, looking like she put a little more effort into her hair and make up than usual.

She rolled her eyes as she pulled the dress down a bit to cover more of her legs. "Not exactly. Just make sure this food gets delivered as quickly as possible". She handed him the money and closed the door.

Once the door to Kate's apartment closed she sighed. It was time. She got her gun out of her suitcase and placed it in her purse. She looked around the apartment one last time and sighed once again. "I'll be back", she said to no one.

She headed down to the building a few blocks away from the warehouse where she said she'd meet Ryan and Esposito. She wasn't really comfortable being an undercover hooker for the night but if it meant finding her mother's killer and getting justice for her family then she wasn't going to complain about the high heel leather boots and the small red dress.

She stopped in front of the undercover car. "Ready boys?" They looked at her and nodded. Ryan was going in with Kathie, undercover of course, while Esposito made sure to keep an eye out for any outside activity.

"You sure you're ready to do this?"

Kathie looked at Ryan. "Yea...It's about time we get justice". She stopped in front of him. "If we don't get out of there alive for some reason I just want to let you know that I appreciate everything you two have done". She placed a friendly kiss on his cheek, trying to get a little into her character. They walked inside the warehouse, acting like a drunk couple. "Well you sure know where to take a girl to show her a good time" Kathie smirked as she pushed Ryan up against the wall, trying to get someone's attention in the warehouse. Sure enough a man came from one of the doors with a gun.

"Who's there!"

Ryan and Kathie both turned their heads towards the direction they heard the voice coming from. They saw the man. The man that had been known as Oliver Dickson. If Kathie didn't have any self control she would of taken out her gun from her purse and shot him right there and then. She looked at Ryan. "I thought you said this place was private" She looked back at Oliver. "Who are you?"

She saw Oliver come closer to them...she also saw him checking her out, which made her want to hurt him even more. He put his gun in the back of his jeans when he just say that it was a drunken man and a hooker...well so he thought. "Oliver, Oliver Dickson. I um...well run this warehouse".

"Really? I like a man that runs his own business" Kathie smirked as she moved from Ryan and walked over to Oliver. "Oliver, I have another question for you..." She acted as innocent as possible as she pushed him into a metal crate, like she did Ryan a few minutes before. "Where were you the night of Johanna Beckett's murder?" When she saw the shocked look on his face and the look that said she had won in cornering him.

She saw his hand go for his gun and she caught his hand. "Nice try" She smiled as she let Ryan take over in restraining him so he could talk to them.

"Don't worry, we won't shoot you if you don't shoot us. Just answer the questions" Ryan said as he placed the handcuffs on him. Normally, he wouldn't restrain their suspect like this but this wasn't just any suspect. This was his friend's mother's killer.

Oliver let out a defeated sigh. "I should of known you looked familiar. She told me to look out for you and your sister".

"Who's she?" Both Ryan and Kathie asked in unison and both confused.

"Look, I didn't kill your mother. I was hired by this woman to take out your sister...she didn't like it very much that I didn't get the job done so I've been well you can say a little on edge ever since".

"Who is she!" Kathie raised her voice wanting to know who her mother's killer was. He didn't answer her. "You're going to jail anyways for trying to murder my sister! I'd be trying to make a deal, you won't get one but I'd still try".

He sighed, again defeated. "I don't know her. She called me and gave me the coordinates to where I would kill Detective Beckett. The money was delivered to me by someone else that works for her. I've been on edge because she's after me and I have no idea what she looks like! At this point I'd rather be arrested than here!"

"Well you're getting your one wish. Oliver Dickson, you have the right to remain silent. Anything you say will be held against you in the court of law. You have the right to an attorney. If you cannot afford one, one will be provided for you". Ryan read him his rights as they exited the warehouse and to the police car. Esposito followed after them.

Kathie had the pleasure of closing the door when Ryan pushed him into the car. She shook her head as she turned around to face Ryan and Esposito. "What's wrong? We just got your sister's sniper in custody".

"It's not that it's just...that was way too easy...it's like they knew we were coming...like she planned this..."

Esposito cut her off. "Hey, Kathie I think you're thinking way to into this. Lets just get this guy in jail and get back to see Kate...especially if Castle told her what you wrote in that note".

Kathie sighed. She hoped her sister wasn't running around the city trying to find her and or a killer. She got into the cop car, it was bigger than the ones they usually used so there was plenty of room. They took off and drove off to the station.

Xxxxx

Castle was seated in his chair next to Kate's desk once again. This time he was the one that was lost in a trance. "Castle?" He barely heard it, so lost in his thoughts. "Rick?" That got his attention. Whenever she said his name like that he knew she was serious. "What's wrong? And don't give me the excuse that your meatball sub is not sitting well with you".

He gave her a soft smile. He had to tell her. It was almost time for her to leave and if she left the station to come home to an empty apartment she would surely know that something was wrong. Gates had left a few hours ago so it wasn't like she was there to stop him. "Kate I..."

He was cut off by the ding from the elevator. Out stepped Kathie, Esposito, Ryan, and a man in handcuffs. Was he the killer?

Kate's expression was pure shock. What was her sister doing with Esposito and Ryan? And why was she dressed like that! "Kathie you better not be a hooker on your free time and they're arresting you as well".

Kathie rolled her eyes. "No, I'm not a hooker". The man in custody looked at her when she said that which caused Kathie to give him one of the famous Beckett glares. "Don't even think about saying anything. You have the right to remain silent, remember".

At that moment Castle knew that this was the killer. He couldn't help but smile. "You guys got him!"

Kate looked at him "Got who!" She then looked at Esposito and Ryan. They had been hiding a secret case from her and using her sister to dress up like an hooker to get this guy out of hiding! Oh she was going to kill them. She glared at all them. "Who wants to start talking?" She crossed her arms.

They all sighed, including Oliver. "Kate, it's not what it looks like", Kathie said walking over to stand by her. "It was my idea".

"Your idea to dress up like a hooker and put yourself in danger! Kathleen how could you..." Kathie cut her off.

"Kate, this guy is your sniper!"

Kate went from confused to serious in a matter of seconds. She looked at the man that was standing next to Ryan and Esposito in handcuffs. This was the man that almost killed her...that shot her through the heart...that made her develop PTSD. She felt Kathie's hand in hers, knowing that if she wasn't there to comfort her she might of pulled out her gun and shot him. "Why'd you shot me?"

"I was paid to. She wanted me to take you down. I thought I did but you're still standing here and now I'm the one she wants dead".

"Who is she?"

"We don't know" Ryan, Esposito, and Kathie said in unison. Kate sighed knowing that they were so close. "We're going to take him down to the cells but we wanted you to see who tried to kill you before hand" Esposito said before him and Ryan headed back to the elevator with Oliver.

Kathie looked at her sister once the elevator doors closed. "Let's go home, Kate...I'll explain everything else then".

Kate had no idea that she could experience so many emotions at one time. There was anger, happiness relief, sadness, and love. Angry that they did this behind her back and she wasn't the one to arrest her own sniper. Happy that they solved the case and her sniper was caught. Relief because her sister and co-workers were alive. Sad because this wasn't her mother's killer and they still had to find an unknown woman. And then there was love. Love that her sister and co-workers would risk their lives just to give her peace from all of this. She looked over at Castle. She nodded and headed back to her desk to get her jacket.

"I'm guessing you didn't tell her about the note?" Kathie said as she took a step forward so she was facing Castle.

He shook his head no. "Lets just say you guys had good timing".

She nodded her head, knowing he was just about to tell her when they walked in. "Thank you and not just for keeping the letter a secret".

He gave her a slight nod as Kate approached them with her jacket on. She looked at Castle. "Good night Castle. Thanks for keeping me company".

"Anytime Kate" He said before Kathie and Kate made their way to the elevator. He sighed. He was glad that Kathie, Esposito, and Ryan were alive and that they had caught Kate's sniper. It was one step closer to putting everything to rest. He picked up his jacket and headed into the elevator.

Xxxx

"So Detective Beckett has a sister? What's she like?" Alexis asked as her father joined her on the sofa, watching the last hour of the movie she rented.

"Well she's like Kate in a lot of ways. She's independent, brave, and all she wants to do is protect her sister and put her mother's case behind them. I didn't really have a chance to meet her one on one. She was only at the station for a few minutes in the morning and then when she came in to tell Kate what happened".

"Is she a cop?" Martha asked sitting in the arm chair next to the sofa.

"No. She's a teacher".

"A teacher? What kind of teacher has training to go after criminals?"

"I don't know. Maybe Kate taught her how to defend herself. Kate never mentioned she had a sibling before because she wanted to keep her safe. She didn't say that directly but I put two and two together".

"A school teacher who is a secretly helping catch criminals? Sounds like a good book idea, Dad" Alexis smirked a bit.

"How do you know she's really a teacher? You just met the woman, Richard. She probably has a good poker face if she's Kate's sister".

Castle shrugged. "I don't know. I just don't want to see Kate to get hurt over this. All of this time I've been keeping working on how to solve her mother's murder a secret and told her to drop the case to protect her. What if she gets shot again now that their on a hot trail again?"

"Darling, I'm sure that everything will be okay". Martha had no idea if what she was saying to her son was true or not but she knew he needed those words of comfort at the moment. He needed some hope that Kate would be okay.

"I hope you're right mother".

xxx

Kate and Kathie walked into Kate's apartment. Once Kathie closed the door she knew she was in for it. "Alright Kate, let me have it".

Kate did not even know where to start. She wanted to yell, she wanted to be mad, but the urge to pull her sister into her embrace was so much stronger than anger. When Kate's arms were around Kathie she was shocked. "Don't ever do that again...not without me".

She rested her head on her older sister's shoulder. "Kate I didn't want you to..."

"I know. But it's my job to be put into danger. Not you. You are a teacher. Sure you have training but this is my case".

"Kate, I want to solve Mom's case as much as you do. I want you to be happy. I know that if I were to die tonight you would have had enough information to catch Oliver...I was not expecting a mystery woman"

Kate's embrace tightened around her sister. "We'll solve this case together. We'll get justice".

Kathie smiled. She knew her sister was right and with the Beckett sisters now working together to solve this case their mother's murderer didn't stand a chance. She looked at her sister and could see that she was still shaken a bit. "Kate, are you okay?"

"That man that shot me...I...well he was in my dreams. That's why I was so quite when you guys brought him in. I saw him in my dreams and he killed you and Castle...sure there was another guy there...at least I think it was a guy...but when I saw him come into the station I was just hoping that my dreams weren't going to come true right there and then".

Kathie sighed. She knew her sister had PTSD and this was not helping her. She brought her sister over to the sofa. "I'll get us the wine. You pick the movie. We'll need something to look forward to after this conversation".