A scene from “Nanny McDead”

Kate Beckett: Exactly how much longer do I have to expect you to be shadowing me on my cases like this?

Rick Castle: Hard to say. When I'm writing a new character, there's no telling when inspiration might strike.

Kate Beckett: I thought I was your inspiration.

Rick Castle: Oh, you are, Detective. And in so many ways.

Kate Beckett: Yeah, well your inspiration might strike you sooner than you think.