Penny Johnson Jerald will make her first appearance on the fourth season premiere of Castle. She address Beckett in this scene.
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Beckett is back at work, fans. Rest easy. This is a photo from the Castle season premiere.
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Castle Season 4 Episode 1 Quotes

I'm not going to lose her again.

Castle

I know I'm not going to be able to have the kind of relationship I want until the wall comes down. I cant do that until this is put to rest.

Beckett