One small murder for man, one giant mystery for mankind.

Kate Beckett: Wait, you signed up to go to Mars. When?
Rick Castle: A couple years ago.
Kate Beckett: Where was I?
Rick Castle: We were fighting.

Kate Beckett: Four adults together in one space, we're bound to step on each other's toes.
Rick Castle: Yeah, well there were a lot more toes than usual tonight.

Kate Beckett: Thanks for coming to get me.
Rick Castle: Always.

Rick Castle: I don't know how you did it.
Kate Beckett: What?
Rick Castle: Kept it together the two months I was missing. Two days I didn't know where you were and it nearly killed me.

The truth is I lured you here to watch you die.

That's your story, Jerry. Why you did everything. You needed to prove it, so I let you.

All the games. All the manipulations. After I screwed up your plans you needed to know you were smarter than me. You needed to know you could control me.

Ryan: Do you think she's still alive?
Castle: She's alive.
Ryan: How do you know?
Castle: Because he's not done with me yet.

It's not just the murder he likes, it's the game.

Only people who keep insisting they're not terrible parents are terrible parents.

You don't have to hunt them anymore. You raise them, like livestock.

Castle Quotes

Beckett: (Clears throat) Ahem. What's the deal with men and boobs, anyway?
Castle: Biological. We can't help it.
Beckett: But doesn't it bother you that they're so obviously not real?
Castle: (Pauses) Santa's not real. We still love opening his presents.

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

Castle