<Tr> <Th_colspan="2"> External links </Th> </Tr> <Tr> <Th> Website </Th> <Td> beta.abc.go.com/shows/castle </Td> </Tr> <P> Castle is an American crime - comedy - drama television series, which aired on ABC for a total of eight seasons from March 9, 2009 to May 16, 2016 . The series was produced jointly by Beacon Pictures and ABC Studios . </P> <P> Created by Andrew W. Marlowe, it primarily traces the lives of Richard Castle (Nathan Fillion), a best - selling mystery novelist, and Kate Beckett (Stana Katic), a homicide detective, as they solve various unusual crimes in New York City . Detective Beckett is initially infuriated at the thought of working with a writer and goes to great lengths to keep him out of her way . However, the two soon start developing feelings for each other . The overarching plot of the series focused on the romance between the two lead characters and their ongoing investigation of the murder of Beckett's mother . </P>

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