Castle “Headhunters” Season 4 Episode 21

Castle "Headhunters" Season 4 Episode 21 airs Monday April 16 at 10:00 p.m. on ABC.

Episode Synopsis: Castle "Headhunters" Season 4 Episode 21 – 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, on "Castle," MONDAY, APRIL 16 (10:01-11:00 p.m., ET), on the ABC Television Network. Read More... 


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