Castle, Season 4

Mr. Smith:
You're a writer, finish this sentence, 'If Weldon had been run out of office-'

Castle:
I'd be gone from the Twelfth Precinct."

Mr. Smith:
And then who'd keep Beckett from looking into things she shouldn't? Who'd keep her out of harm's way?

Castle:
So you did this to protect her? Why?

Mr. Smith:
You play chess, Mr. Castle? Sometimes a well-placed pawn is more powerful than a king.