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 14 ·
The G.D.S.
Castle returns to the City of Angels in search of answers about his missing time. But things take a deadly turn when he’s recruited by the legendary Greatest Detective Society to help solve a murder.
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Episode 14 of season 8 of Castle: “The G.D.S.”. Aired 2016-03-07. Watch it online free on ZapFlix.