Season 4, Episode 21 Headhunters
First Aired: April 16, 2012
When things get tense with Beckett, Castle decides to team up with a new partner: a tough gang-unit detective who exposes him to a seedier side of police business and puts him in risky situations.
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- Premiered: March 9, 2009
- Rating: TV-PG
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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)