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Linchpin (2)

Castle

Run Time: 45 mins

Air Date: Mon, 20 Feb 2012

Average Rating: ⭐ 7.941 (17 votes)

ABC

Season 4 - Episode 16

Linchpin (2)

Average Rating: ⭐ 7.941 (17)

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. Their efforts continue to put Castle in contact with Sophia Conrad - a smart, commanding and sexy CIA operative who was Castle's inspiration for Clara Strike in the "Derrick Storm" series of books; and intelligence officer Martin Danberg is back.

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