After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New York City to tag along with an NYPD homicide investigation team for research purposes.

After a botched assassination attempt, the mismatched duo finds themselves in Paris, struggling to retrieve a precious list of names, as the murderous crime syndicate's henchmen try their best to stop them. Once more, Lee and Carter must fight their way through dangerous gangsters; however, this time, the past has come back to haunt Lee. Will the boys get the job done once and for all?

A disgraced former LAPD detective leads a home invasion in search of millions in stolen money. The plan goes awry and homicide detectives seeking answers interrogate the only survivors; a thief and a victim.