Rick holds a baby boy who's been abandoned in a church on Castle. "The Good, The Bad, and The Baby" is the tenth episode of the show's sixth season.

Castle Season 6 Episode 10 Quotes

Castle: When we do this, let's not do the dead body in the middle of the aisle.
Beckett: OK. Good call.

Beckett: So you guys dress up for Thanksgiving?
Castle: Doesn't everybody?
Beckett: No, I think that's pretty special to you.