American crime drama television series which primarily traces the lives of Richard Castle (Nathan Fillion), a best-selling mystery novelist, and NYPD Detective Kate Beckett (Stana Katic) as they solve various unusual crimes in New York City.

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Is there any hidden significance to the song at the end o S06E09?

Just before the credits at the end of Castle S06E09 there is this scene: The look on Becketts face made me think it could have an underlying meaning other than 3XKs ...