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 7 · Episode 8 ·
Kill Switch
When subway passengers, including Detective Esposito, are taken hostage by a mysterious gunman, Castle, Beckett and the team must uncover the gunman's agenda before it’s too late.
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Episode 8 of season 7 of Castle: “Kill Switch”. Aired 2014-11-24. Watch it online free on ZapFlix.