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 4 · Episode 6 ·
Demons
While doing some investigative work at a New York mansion, a prominent ghost hunter is murdered. Castle and Beckett must figure out if paranormal activities are to blame.
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Episode 6 of season 4 of Castle: “Demons”. Aired 2011-10-24. Watch it online free on ZapFlix.