After 4 seasons, Kate showed up at Castle's door to tell him exactly what she wanted. The kiss up against the door in "Always" left shipper hearts aflutter for the entire summer.
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Talk about a "Knockout" punch. In the Castle season 3 finale, Kate Beckett is shot by a sniper at Capt. Montgomery's funeral. All Castle can do is hold her and tell her he loves her.
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In the Castle season 1 finale, "A Death in the Family" Kate Beckett is devastated when Castle does the one thing she asked him not to do, look into her mother's murder.
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A charming man from Beckett's past turns up just before her wedding on the season finale of Castle. "For Better or Worse" is the 23rd episode of the show's sixth season.
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Who is the dead man that Kate had under investigation and how was he killed? "Veritas" is scheduled to air Monday, May 5th.
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Kate has a long history of keeping secrets. If she was performing her own private surveillance operation, did she share it with Castle?
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Kate Beckett may be in the crosshairs in an entirely different way. Will the
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Things get serious when a man Beckett was secretly watching is killed on Castle. "Veritas" is the 22nd episode of the show's sixth season.
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Castle Quotes

I can't help it if you got off by putting things in my mouth.

Beckett

Castle: They're going to kill you Kate, and if you don't care about that, please think about how that's going to affect the people who love you. You really want to put your dad through that? What about Josh?
Beckett: And what about you Rick?
Castle: Well of course I don't want anything to happen to you. I'm your partner, I'm your friend.
Beckett: Is that what we are?
Castle: You know what? I don't know what we are. We kiss and then we never talk about it. We nearly die frozen in each others arms, but we never talk about it. So no, I got no clue what we are. I know I don't want to see you throw your life away.