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 5 · Episode 21 ·
The Squab and the Quail
When Beckett is assigned to protect Erik Vaughn, a charming billionaire entrepreneur whose life is in danger, she's forced to reflect on her relationship with Castle which has begun to plateau. Meanwhile, consumed with jealousy, Castle goes to extraordinary lengths to solve the case and separate the two of them.
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Episode 21 of season 5 of Castle: “The Squab and the Quail”. Aired 2013-04-22. Watch it online free on ZapFlix.