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 8 · Episode 15 ·
Fidelis Ad Mortem
When a recruit officer at the NYPD Academy is killed, Beckett and the team go back to their old training ground to investigate. Meanwhile, Castle must reckon with a decision with profound consequences for him and Beckett.
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Episode 15 of season 8 of Castle: “Fidelis Ad Mortem”. Aired 2016-03-21. Watch it online free on ZapFlix.