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

No place to get married and no one to get married to. I'd think disaster is an understatement.

Here I thought you were a one and done kind of girl.

Ryan: Just imagine your wedding guests are murder suspects.
Esposito: In their underwear.

Castle: She's proud of you. Wherever she is. She's proud.
Beckett: I never could have done this without you.

Castle: Guys, she wouldn't want you involved.
Esposito: We're already involved. We're family, bro.

Beckett: I love you.
Castle: Yeah, well you better. It's two weeks to the wedding and it's too late to return the tux.

Now just take your turn and feel the bitter sting of defeat.

Beckett: Castle, aren't there more important things than winning?
Castle: Oh, that's a notion created to comfort those who lose.

Beckett: I think catching killers is pretty extreme and then there's marrying you.
Castle: Ah yes, I admit I am extreme. Extremely handsome.
Beckett: With a high degree of difficulty.

Richard Castle, one word short. I cannot allow this to be my epitaph.

Alexis: Halter tops were big in the '70s.
Castle: So were those peasant blouses. Why didn't you wear one of those?

Castle Quotes

Sometimes the hardest things in life are the things most worth doing.

Castle

Castle: You're not alone in this. I'm here.
Beckett: I know.