Ready for a major development between Castle and Beckett? Tune in for the episode "Knockdown."
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Beckett and Castle are in for some major developments on "Knockdown." Both personal and professional.
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This photo speaks for itself: it's a shot of Castle and Beckett finally kissing.
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Castle Season 3 Episode 13 Quotes

It's different when it happens right in front of you.

Beckett

Raglan: What part of no cops don't you understand?
Beckett: He's not a cop.
Raglan: Than who is he then?
Beckett: Just someone I trust.