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 3 · Episode 3 ·
Under the Gun
When a coded document attracts Castle's attention, Beckett must steer the case back to the violent felons who populated their victim's world; when Beckett's ex-partner arrives, Castle must watch the relationship become romantic.
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Episode 3 of season 3 of Castle: “Under the Gun”. Aired 2010-10-04. Watch it online free on ZapFlix.