The day after Derek received Penelope's letter, he hired a private investigator. He knew that it was useless but he had to do something. The only thing the PI was able to find was that she packed up her whole apartment and had movers come and move everything to a storage unit she had already paid for in cash. She had also got out of her lease by paying what she had left on it. No one at the apartment building she lived in knew where she went. She had also closed out her back account. He was at a dead end. He need to find her and find her fast. That was his baby she was carrying and he had rights.

When the team found out later that day that Pen had quit, they all turned to Derek. They knew it had something to do with his engagement. Everyone knew how much she loved Derek. That was no secret except of course to Derek himself.

"She left because of you, didn't she?" Reid asked. "She left because you pushed her away when you met Savannah. We all saw that."

"Savanah couldn't understand my relationship with Garcia, so she asked me to stop it."

"And like the idiot you are, you just threw away a friendship you had for over eight years. What happened to her being your light, you God given solace?"

"I don't have to explain anything to you Reid."

"No you don't but you could have at least explained it to Penelope."

"That's enough." Hotch said. "Garcia is gone. We have to learn to work without her. There will be a new tech starting tomorrow."

"It won't be the same." JJ said. "Why would she leave without saying goodbye?"

"She probably knew that we would try to convince her to stay." Rossi said. "And she would be right."

"Look I won't take the blame for this. Garcia is a grown woman that made her own decision to leave. I didn't ask her too."

"Let's get back to work and until we have a case we do paper work."

Hotch walked out with Dave on his heels. He closed the door once he was in Hotch's office.

"Aaron do you think this has anything to with you finding her crying in her office?"

"I wasn't the only one that found her crying. I didn't even know she was going to quit. I came in this morning and this what I found in my box."

He handed Dave the letter and watched as he read it. "This doesn't give us a reason why she just up and left. I knew she would be upset with Derek announcing he was getting married but I didn't expect this. There has to be more to it."

"I agree but with her gone, I'm pretty sure she's covered her tracks. If anyone knows how to do it, it's Garcia."

In the conference room

"I know this is more than you getting married. What happened between you two that she shut down completely? She was always her usual Garcia self until two months ago. I know something happened because I found her crying in her office. When I asked her what was wrong, she said she had allergies. Garcia has never complained about allergies." Reid said.

"I found her crying in the bathroom and she said the same thing." JJ said. "I knew she didn't want to talk about it so I dropped it. Now I wish I hadn't."

"I'm going back to my office."

Derek left because he couldn't listen anymore. She was crying because of him and his stupid mouth. As soon as the word mistake came out, he knew he said the wrong thing. He left when she walked into the bathroom.

Derek came out of the bathroom and smelled coffee. He went looking for Pen not knowing what he was going to say. He had the most amazing night of his life with Penelope. He had loved every minute of it. They had made love so many time that he had lost count. He had whispered to her how much she meant to him and how much he loved her. She turned when she heard him.

"Hey hot stuff. I made coffee." She said handing a cup. "What do you want to do today?"

"Pen …"

"You want to watch movies or go the park. We can take Clooney with us."

"Pen …"

"Or you want to go back to bed."

"Penelope." He shouted. "Listen. Last night was a mistake. It never should have happened. I'm sorry. I'm going to ask Savannah to marry me."

He could still see her flinching at the word mistake as if he had slapped her. In hindsight, that was exactly what he did. That was when he realized she loved him in a way he never would. Would he? But then why did he sleep with her if he never thought of her in that way? That was the question that he asked himself the most. She just stared at him with tear filled eyes and then she turned and walked to the bathroom locking the door. He wanted to go talk to her but he thought it was better that he left. They didn't talk anymore after that day. She called to talk to everyone else except him. She never went out to dinner, to the bar after they got back from a case. He knew the team asked her why and she would just say she was tired or not in the mood. He did try to call her once and she ignore him. She was the epitome of professional at work, only talking to him if the need arose. Hotch caught on pretty quick that something was wrong between them and didn't ask Derek to call her. He pulled out the picture of their baby and stared at it. He wanted to know how she was and the baby but he would have to wait until she contacted him. He still hadn't told Savannah yet. He didn't know how. She would be angry. How do you explain to your fiancée that you're having a baby with someone else? He hadn't even told his mom anything. His phone rang and he smiled.

"Hey baby."

Three months has passed with no word from Pen. Derek was going crazy because he didn't know how she was doing. He missed her so much. He didn't realize how much until it was too late. He took advantage in knowing if she didn't talk to him he would still be able to hear or see her at work. Now he had neither.

Savanah had wanted to set a date for the wedding and she was set on Valentine's Day. He said no. He couldn't do that to Pen. He couldn't get married on their baby's due date. He couldn't hurt her that way and he had done enough already. So he asked for some time in November and Savannah agreed. They would be getting married the Saturday before Thanksgiving, which was a month way. They had everything set and ready to go.

He walked into his office and found a manila envelope waiting for him. He closed his door and sat down and opened it. He pulled out a disk and a letter. With his heart in his throat he opened the letter.

I hope this letter fines you well, Derek. I just wanted to update you on what's been going on these last three months. I'm a little over five months now and the morning sickness has passed. I can feel the baby move now. He or she moves around a lot at night keeping me up. Everything is good with the baby and the doctor said he or she is growing like he or she should. My due date hasn't change. I did have an ultrasound the other day and I found out the sex of the baby. I debated if I wanted to find out or not but not have anyone to tell one way or the other I chose to find out. Look at the disc. I had a copy made for you.

I miss you.

Pen

He open the disc and put into the computer. The screened filled with an image of a baby. You could see the face, arms, legs, and the heart beating. He watched in fascination as the baby the moved. When the baby opened its legs Derek gasps. A tear ran down his face when he realized he was looking at his son. Penelope was giving him a son. They were having a son. He touched the screen. He picked up the letter and for the first time he saw the corner had an arrow pointing. He turned to letter over and laughed. On the back of the letter in blue writing were the words.

It's A Boy, a mini hot stuff!

Derek was still smiling when the video ended and he started it again. His phone rang and it was JJ telling him they had a case. He closed his lap top and went to the conference room. They were headed to Detroit and it was a bad one. He went to his office to collect his bag and to call Savannah. He noticed his office door was open and he went in. Savannah was sitting in his chair looking at the computer screen. She looked and he saw the tears running down her face. He closed the door and leaned against it.

"What is this?"

"Let me explain."

"How are you going to explain this?" she shouted. "How long have you known?"

"Savanah …"

"How long Derek?"

"I found out three months ago."

"You found out three months ago that you were having a baby with the bitch I told you to stay away from."

"Don't call her a bitch because she isn't one."

"Oh really, what woman sleeps with another woman's boyfriend. Have you been sleeping with her the whole time we've been together?"

"No it was just one night five months ago."

"How do you even know that it's yours?"

"Pen isn't that type of women."

"I guess you would know." She said. "When is she due?"

"Valentine's day."

"What? Is that why you didn't want to get married that day, because of her. So what I'm just supposed to step aside while you have a baby with another woman."

"I still want to marry you."

"Damn right you will. Everything is set and you will not humiliate me this way. How could you do this to me Derek?"

"I'm sorry. I don't know what else I can say."

"Where is she? I want to talk to her."

"No you will not talk to her." he said. "Besides she's not here. She quit three months ago and no one has seen or heard from her. I just get these updates every now and then."

"How can I believe you are telling me the truth?"

"She's gone and I don't know where she is."

"You tried to find her didn't you. That's why you've been acting weird these last couple of months."

"I didn't know how to tell you."

"Does anyone know?" she asked. "Does your mother know?"

It was no secret that Fran didn't really like Savannah but Derek loved her and that was all that mattered. Fran always thought that Savannah acted like she was better than them.

"Only Hotch knows. No one else."

"Why does he know?"

"He got the letter saying we were getting a new tech since Penelope quit. No one else knows the reason why she left."

"So you are never going to see that baby. Well that's a good thing."

"What are you serious? How can that be a good thing?" He yelled. "That is my son and I will be a father to him."

"How are you going to do that if she's not here?"

"She's coming back when she's closer to her due date. She wants me there when she gives birth and I will be there. She won't deny me access to my son."

"Maybe it would be better if she did."

He stared at her with shock on his face. He phone rang and he answered. "Yeah, I'm on the way."

"Look Savannah, I have to go. We caught a case in Detroit. We'll talk later."

He walked to his desk grabbed the letter that he had hidden in the drawer, grabbed the disc out of the computer and the letter that came with it and put it all in his go bag. He wasn't leaving it with Savannah in the room. He wasn't taking the chance that she would destroy the only things he had of his son. He left without a backwards glance at Savannah.