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 6 · Episode 18 ·
The Way of the Ninja
When a Japanese ballet dancer is mysteriously murdered, Castle and Beckett's investigation into her secret life uncovers evidence that she was killed by a ninja, and now that ninja is coming after them.
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Episode 18 of season 6 of Castle: “The Way of the Ninja”. Aired 2014-03-17. Watch it online free on ZapFlix.