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Season 4 Episode 16

Title: Linchpin
Air Date: February 20, 2012 at 10:00 PM PST

In the explosive conclusion of a two-part story arc that began 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. In the episode, Jennifer Beals (The Chicago Code, Flashdance) continues as 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 Josh Stamberg (Drop Dead Diva) is back as intelligence officer Martin Danberg.

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