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 17 ·
Countdown (2)
With time running out, Castle and Beckett must put aside their differences with Agent Fallon to avert a city-wide catastrophe.
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Episode 17 of season 3 of Castle: “Countdown (2)”. Aired 2011-02-28. Watch it online free on ZapFlix.