Disciple

Disciple is the 9th episode of the 6th season of ABC TV series Castle that aired November 18, 2013 and was written by David Amann and directed by Rob Bowman.

Synopsis
Castle and Beckett investigate a homicide in which the victim strongly resembles Lanie, and soon the team believe that members of the 12th Precinct are the killer's next targets.

Esposito & Lanie - Quotes

 * Lanie: So, who's he gonna go after now--you and me, some version of Ryan and Beckett? What if this is just the beginning?
 * Esposito: Hey...it'll be okay. I promise. I won't let anything happen to you.
 * Lanie: Yeah? What if something happens to you?