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 23 ·
For Better or Worse
Castle and Beckett's long-awaited wedding is almost here, but when a shocking surprise threatens to ruin the big day, they are sent on a wild mission filled with masked men, angry bikers and a charming ne'er-do-well from Beckett's past.
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Episode 23 of season 6 of Castle: “For Better or Worse”. Aired 2014-05-12. Watch it online free on ZapFlix.