Castle is a best-selling mystery writer. Castle was plagued with writer's block after killing off his popular lead character, Derrick Storm, whom he no longer found inspiring. He then found himself involved in the case of a copy-cat killer recreating murder scenes from his novels, investigated by NYPD Detective Kate Beckett. Castle discovers a new source of inspiration in her and soon begins shadowing her investigations, affording him the opportunity to use his knowledge and skills to help solve murders. After meeting Beckett, Castle is inspired to begin a new series of novels about a female NYPD detective named Nikki Heat.
Beckett is a homicide detective with the NYPD, she is a first-class investigator who has gained a reputation for being intrigued by unusual cases. She joined the force after her mother was murdered in an unsolved case. She is a brave women and tomboy female.
