Aired
February 20, 2012
Castle
Castle
Linchpin (2) #S04E16
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.
Episode 16 of Season 4 from Castle — available to stream in HD on any device.
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