When someone starts using his books as the blueprints for brutal murders, a mystery novelist begins assisting the NYPD with some of their homicide cases, whether they want his help or not.
9:30pm - 11:30pm
Castle and Beckett arrive at a crime scene to discover that the female victim bears a shocking resemblance to Medical Examiner Lanie Parish. As the team tries to make sense of this mystery, they realise the killer may be targeting detectives of the 12th Precinct. Then, nothing is as it seems when Castle and Beckett investigate what appears to be the assassination of an intelligence operative. Meanwhile, Beckett's romance with Demming threatens her relationship with Castle, forcing them to confront their feelings for each other.