New detective Sully desperately wants to be part of the team.
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Alicia Logano guest stars as an accused murderer who takes hostages and will only speak to Castle. "Number One Fan" is the fourth episode of the show's sixth season.
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Rick arrives to help negotiate the release of hostages on Castle. "Number One Fan" is the fourth episode of the show's sixth season.
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Can these hostages count on Rick to help set them free on Castle? "Number One Fan" is the fourth episode of the show's sixth season.
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Hostages are taken and an accused murderer insists on speaking to Castle. "Number One Fan" is the fourth episode of the show's sixth season.
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Is the calvary coming to rescue Rick and the hostages on Castle? "Number One Fan" is the fourth episode of the show's sixth season.
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Rick tries to convince a fan of his to let her hostages go on Castle. "Number One Fan" is the fourth episode of the show's sixth season.
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Can Rick convince an armed hostage taker to release her hostages on Castle? "Number One Fan" is the fourth episode of the show's sixth season.
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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.

Kate