Castle Season 6, Episode 4: “Number One Fan” Promo — A Killer Only Wants Castle (VIDEO)

As a super successful mystery writer, Castle (Nathan Fillion) has legions of adoring fans, but on next week’s episode of Castle one such admirer — who also happens to be a known killer — takes things a bit too far when she’s taken several people hostage and wants only to interact with the writer himself. “She is demanding to speak to only you,” Captain Gates says begrudgingly. By the looks of the promo for Season 6, Episode 4: “Number One Fan” below, Castle goes in to speak with the killer,...


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