Castle › Season 4

S4 E16: Linchpin (2)

Name: Linchpin (2)
Released: 2012-02-20

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.

Air date	Feb 20, 2012
Runtime	44 minutes
TMDB rating	★ 7.9/10