Season 4, Episode 16 Linchpin

First Aired: February 20, 2012

Conclusion. Castle and Beckett try to stop a series of events that could lead the U.S. into a war, and their efforts continue to put Castle in CIA agent Sophia Conrad's orbit.

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Guest Cast

Jennifer Beals Sophia Conrad
Josh Stamberg Martin Danberg

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  • Premiered: March 9, 2009
  • Rating: TV-PG
  • User Rating:4.75 out of 5 (5,834 ratings)
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  • Premise: Successful mystery novelist Richard Castle starts working with the New York Police Department (NYPD) homicide investigation team after a serial killer decides to use plots from his novels for no good. (more)

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