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

In the explosive conclusion of a two-part story arc that began last week with "Pandora," Castle & 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.
Castle Season 4, Episode 16: "'Linchpin" airs Monday, February 20, 2012 at 10 p.m. ET.


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