Castle Promo for Season 4, Episode 16: ''Linchpin'' (VIDEO)

Credit: YouTube

In the explosive conclusion of a two-part story arc that began last week with “Pandora,” Castle and Beckett race to find the “Linchpin” in order to stop the first domino in a chain of events which will plunge the United States into war.


Original Air Date: Castle Season 4, Episode 16: "'Linchpin" airs Monday, February 20, 2012 at 10 p.m. ET on ABC.

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