"It wasn't me, Kate."

"Castle." picking up the phone, Castle had no idea why anyone would be calling in the middle of the night.

"They think it was you." Beckett's voice was weak and low, and those words made Castle open his eyes wide, even though he had just waken up.

"What do you mean?" he uncovered himself and sat on the bed, his feet now touching the floor as he rushed one hand by his hair.

"Ryan and Esposito think you're the killer, Castle."

"What?" he got up, and stood on both of his feet, quickly forgetting how badly he needed to sleep. "It wasn't me, Kate."

"I know." he could hear a sigh on the other side of the phone, and that made him sigh right after she did.

"I don't have an alibi. Well, not one that I can actually tell." he started walking in circles, his hand on his head, his bare feet touching the cold floor weren't even a problem, and all he could think about was the fact that he was screwed. He wasn't a killer. Not a real one. The closest he had been to killing someone was probably when he shot one guy's knee to protect Beckett. Or in his books.

"I know, Castle, I know. I'm sorry," she finally said, making Castle smile lightly. Not because he was happy, because he definitely wasn't. Just because she was saying she was sorry. The strong and powerful detective Kate Beckett was apologizing to him.

"What am I going to do?" he asked, now standing still.

"I'm outside, next to my car now. Ryan and Espo said they were going to get something before we headed to your house. They're going to arrest you for being a suspect." God. He was definitely screwed.

"Beckett, you're my alibi." he finally mumbled, now sitting on the bed again. He couldn't stay still for long.

"And what am I supposed to do? Tell Gates that we were having extremely hot sex while that guy was killed so you can't be the killer?"

"Did you just say extremely hot sex?" he frowned his eyebrow and looked up, his face lightning up with a smile.

"The point is - we need to figure something out, Castle. I might lose my job. Or you. I don't know if I'm rea-" she suddenly stopped speaking, and Castle looked down to his feet for a second, making a confused face.

"Kate?" he said once, a worried look and voice now taking over him.

"You talking to someone, boss?" he could hear on the other side of the phone. The voice seemed to be Esposito's.

"No, I was just going to call you. What took you so long?" Beckett replied.

"Kate?" he shouted, this time even louder, not understanding what was happening.

Suddenly, he realized she had hung up on him. They were probably on their way to his house. And he needed to figure something out. Quickly. Or he'd be screwed. Kate would be screwed. And everything would turn into a mess. Not that it wasn't already. Just a bigger one.