8 Season
173 Episode
Castle - Season 4 Episode 21 Headhunters
A whole new chapter in crime solving.
With tensions rising between Castle and Beckett, Castle finds himself a new partner -- Detective Ethan Slaughter (guest star Adam Baldwin, "Firefly"), a tough and colorful cop from the city's gang unit. But Castle gets more than he bargained for when Slaughter shows him a grittier side of police work that puts Castle in the line of fire like never before
- Year : 2016
- Country : United States of America
- Genre : Drama, Crime
- Studio : ABC
- Keyword : new york city, police, writer, novelist, criminal investigation, female detective, homicide detective, criminal consultant, police procedural, cheerful
- Director : Andrew W. Marlowe
- Cast : Nathan Fillion, Stana Katic, Molly C. Quinn, Jon Huertas, Seamus Dever, Susan Sullivan
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