Castle
After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New York City to tag along with an NYPD homicide investigation team for research purposes.

Season 6 · Episode 4 ·
Number One Fan
A desperate young murder suspect, Emma Briggs, takes hostages at gunpoint then mysteriously insists that she will only negotiate with one person: Richard Castle.
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Episode 4 of season 6 of Castle: “Number One Fan”. Aired 2013-10-14. Watch it online free on ZapFlix.