Castle - Season 4 Episode 16 Linchpin (2)
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.
- Genre: Drama, Crime
- Studio: ABC
- Keyword: new york city, police, writer, novelist, criminal investigation, female detective, homicide detective, criminal consultant, police procedural
- Cast: Nathan Fillion, Stana Katic, Molly C. Quinn, Jon Huertas, Seamus Dever, Susan Sullivan
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