Lanie enters the autopsy room the following morning. It's early, and she has just returned from a crime scene. She flips on the light, and finds Kate sitting on the end of the autopsy table.

"What are you doing here?"

"I needed to talk to you," she admits, refusing to meet Lanie's glance.

"I didn't know that you were in town."

"I wasn't planning on being here."

"Then, why are you in my morgue at seven a.m. on a Sunday?"

"I didn't know where else to come. I didn't know who else to talk to," she answers.

"What's on your mind?"

"I had a question."

"Regarding a case?"

"Yeah," she fibs.

"Go ahead," Lanie insists.

"At what point can an amniocentesis be done to determine paternity?"

"That test is usually performed between sixteen, and twenty two weeks. There are other tests that can be done earlier. A chorionic villus sample can be taken at ten weeks. A fetal cell prenatal paternity test can also be performed at ten weeks. Why are you asking?"

"For a case," she flat out lies.

"Really?" Lanie eyes her suspiciously, cocking one eyebrow.

"Yes."

"You came all the way here to ask me that?"

"I came home for other reasons."

"That were not case related?"

"Correct," she nods.

"You could have just called me on the phone," Lanie points out.

"Right."

"Where is your coffee?"

"What coffee?"

"Is there something you want to tell me?"

"Like what?"

"Kate why would you need to know about paternity testing during pregnancy?"

"I just do," trying to wriggle out of the interrogation Lanie is attempting to put her through.

"Is someone that you know pregnant?"

"Yes."

"And they need a prenatal paternity test preformed?"

"Yes."

"Who?"

"It doesn't matter," Kate insists.

"You're pregnant?" Lanie guesses.

"I didn't say that."

"You didn't have to. The guilty look on your face said it for you."

"I just found out."

"When?"

"Yesterday."

"So you haven't been to the doctor to confirm yet?"

"No."

"Wait, why would you need to know about paternity testing?"

"I should go. Coming here was a mistake," Kate vacates her seat on the end of the autopsy table. She heads for the double doors.

"Wait. Where are you going?" Lanie queries as Kate steps past her.

"I..."

"Come back here," Lanie places her hand on Kate's shoulder.

Kate takes a few steps back. She looks at her friend, "What?"

"How far along are you?"

"I don't know for sure. Anything I say would just be a guess."

"If you had to guess," Lanie prods.

"I would prefer not to."

"The baby isn't Castle's?"

"It is complicated."

"How did I not see this? How could I miss this?"

"Miss what?"

"It was you," Lanie shakes her head in disbelief.

"What was me?"

"Javi told me that he slept with someone else. He said it was a mistake. He wouldn't tell me who it was. I didn't understand. He told me that he cheated, it didn't make sense that he didn't say with whom. Now I get it. He would only leave out that detail if he was trying to protect someone. It was you, wasn't it?"

"Lanie I..."

"You what? We have known each other for how long now? And you're going to stand here, in my morgue, look me in the eye, and lie?"

"No."

"Then you need to tell me the truth."

"He came over the night Castle proposed."

"Why?"

"He knew what Castle was planning. He spoke to him after. He knew that I had gone home, alone to think. He came over to give me advice."

"And the two of you ended up having sex?"

"He brought tequila. I don't know what got into me. I don't know why I drank so much."

"So when he came onto you, you gave in?"

"It wasn't like that."

"It wasn't?"

"It was worse," she admits.

"How could it be any worse?"

"Apparently I am the one who came onto him. I am the one who is responsible for all of this."

"What? Why?"

"I don't know."

"And what do you mean, apparently?"

"I don't remember any of it," Kate reveals.

"You were that drunk?"

"I woke up passed out on my living room floor. He wasn't there when I woke up. I had no idea what happened."

"Kate please tell me that this is just a bad nightmare, because none of what you are telling me sounds real. I can't believe either of you would do something like this."

"Lanie, I am so sorry."

"Why didn't you tell me?"

"Because I didn't know. Javi told me what happened, yesterday."

"When you were looking for Castle?"

"I was so pissed. We had an argument about having kids. He stormed off. I left the apartment to go after him, and out of nowhere I started puking my guts up. That made me even angrier, because I thought he was to blame. I thought maybe I was pregnant. I thought that maybe it was his fault. What if he did it on purpose?"

"You know him better than that."

"Yeah, I do."

"But then again, I thought that I knew you better than this. I thought that you were my friend."

"I am your friend. Lanie I am sorry."

She shakes her head, "Sorry isn't going to cut it this time. How could you do this? How could you ruin the lives of three other people, and just be okay with it? You betrayed me. What about Castle? I am sure that you have successfully managed to break his heart. And you don't even feel bad about it, do you?"