Esposito: So...Castle's last case, huh?

Kate: Hmm~

Esposito: Ryan and I thought we do a little going away party.

Kate: (unnaturally) Yeah, well, it's not like he's leaving forever.

Esposito: You sure about that?

Kate:...

Esposito:(looking into kate right in the eye) Why do you think he's being following you around all this time? What...research? The guy has done his research like fifty books. (pause) Look, whatever the reason is, I'm pretty sure it doesn't include watching you be with another guy.