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 7 ·
Once Upon a Time in the West
When Castle and Beckett learn that a murder victim may have been poisoned at an Old West-style resort, they visit the resort posing as newlyweds to uncover the truth.
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Episode 7 of season 7 of Castle: “Once Upon a Time in the West”. Aired 2014-11-17. Watch it online free on ZapFlix.