Castle Season 03 (2009)

Richard Castle (Fillion) is a famous mystery novelist. Bored and suffering from writer's block, he kills off the main character in his successful book series. He is brought in by the NYPD for questioning regarding a copy-cat murder based on one of his novels. He is intrigued by Kate Beckett (Katic), the detective assigned to the case. Castle decides to use Beckett as his muse for Nikki Heat, the main character of his next book series and uses his friendship with the mayor to force the police to let him shadow Beckett. Castle's exuberant man child personality clashes with Beckett's more reserved and professional demeanor, but the two eventually become friends and then lovers. Their cases often deal with murders occurring within various unusual subcultures or milieus, including reality TV shows, vampire enthusiasts, a science fiction convention, and a man who claims to be a time traveler. A recurring plot line deals with the unsolved murder of Beckett's mother years before, an investigation which leads to an increasingly sprawling, and dangerous, conspiracy.