Castle (2009)

When a cunning serial killer starts replicating the plots of his novels, celebrated mystery author Richard "Rick" Castle is granted an unusual opportunity by New York City's Mayor. He joins an NYPD homicide investigation team, ostensibly for research. As Castle delves into the dark side of his own creations, he becomes entwined in a gripping cat-and-mouse game. The partnership offers not only insights into his fiction but also a firsthand look at the intricate dance of real-life crime-solving. This collaboration blurs the line between imagination and reality.