Where To Stream Castle Season 4 Episode 16
Linchpin
- Aired February 20, 2012
- 60 Min
- Rated 8.3
- Number 28 Of 173 Rated Episodes
In the explosive conclusion of a two-part story arc that began last week with "Pandora," 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.