Castle Season 4 Episode 21

Watch Castle Season 4 Episode 21 Online

Episode Name:  “Headhunters”

Episode Summary:   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.

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Castle Season 4 Episode 20
Castle Season 4 Episode 22

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