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Watch Castle Season 6 Episode 4 online via TV Fanatic with over 4 options to watch the Castle S6E4 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, and Google Play.

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Episode Details

Castle Season 6 Episode 4: "Number One Fan"

On Castle, a woman accused of murder takes hostages and insists she'll only speak with one person. Rick Castle.

Castle Season 6 Episode 4 Quotes

Kate: I might as well apply to become a mall cop.
Castle: Ooh, you would look great on a Segway.

I don't know what to do about my life.