What's a fiance for if not to find her future wife's current husband?

Castle: You should know it, you're engaged to a genius.
Beckett: Yes, a genius at annoying me.

Beckett: Tell me this is still part of the fairy tale.
Castle: If it is, it's a Grimm one.

You can't give up. That's the deal. We want the happy ending, we can't give up.

Castle: A crime scene at a fire. I've never done one of these before.
Ryan: After this you might not want to.

Can we canvas the area? And by we I mean obviously somebody else.

If this is a tea company, I'd like a cup.

Lipstick marks on my shirt? Where? Beckett will kill me.

Castle: How about we have a winter wedding?
Beckett: Didn't we say we wanted to do it outside?
Castle: Oh, right. Frostbite isn't very festive.

Martha: A little unsolicited advice.
Castle: Do you give another kind?

Hunt: You're getting emotional and now's not the time.
Castle: Really cause it's been about 40 years. When would be a good time?

Castle: How old would you say that kid is?
Martha: Old enough to do all the things you did at his age.

Castle Quotes

I need time to stop being mad and you need time to figure out a way to be OK with this.

Alexis

I tried to stay in the car I really did.

Castle