Castle

A murder-mystery writer and a homicide detective team up to solve unusual crimes in New York City, and their professional relationship soon crosses the line into romance.

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