Created by Andrew W. Marlowe, it primarily traces the lives of Richard Castle, a best-selling mystery novelist, and NYPD Detective Kate Beckett 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 show focuses on the romantic tension between the two lead characters, and also on the unsolved homicide of Beckett's mother.