Richard "Rick" Castle is a millionaire playboy who recently killed off his main character when a serial killer starts killing people like he does in his books. He teams up with New York police detective Kate Beckett to solve the case. He finds inspiration in Detective Beckett and starts shadowing her for his next book.
'Til death do us part.
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Did You Know?
Later seasons featured less interaction between Castle and Beckett, often explained by plot devices such as Castle becoming a PI or Beckett pretending that they were broken up. Reportedly, this was due to the fact that the real life relationship between Nathan Fillion and Stana Katic had deteriorated so much that the two found it difficult to work together. Towards the end of the series, the two actors only ever spoke to each other while in character and reciting their lines, and otherwise refused to even be in the same room. See more
To obtain reluctant witnesses' cooperation, Castle will occasionally offer to name a character in his Nikki Heat books after them, often right in front of Beckett, or Ryan and Esposito. While it might appear to be a harmless offer, any competent defense attorney could paint it as bribery and witness tampering, which are both illegal; as cops, they don't seem bothered by an action that could potentially get a solid case against a suspect thrown out at trial. See more
[whatever Castle has done