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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Things get tense for Rick when he's called in to get an accused murderer to release her hostages on Castle. "Number One Fan" is the fourth episode of the show's sixth season.
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Can Rick 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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Rick tries to keep things calm when he gets called into a hostage situation on Castle. "Number One Fan" is the fourth episode of the show's sixth season.
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Rick tries to talk down a tense situation 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