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 21 ·
The Dead Pool
When a champion swimmer and Olympic hopeful is found dead in a training pool, Castle & Beckett dive in to investigate his murder, and uncover myriad secrets that might have led to his death.
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Episode 21 of season 3 of Castle: “The Dead Pool”. Aired 2011-04-11. Watch it online free on ZapFlix.