(Stana Katic): Castle's fiancée, who at the start of the episode is technically out of a job but assists the team in the investigation.
(Alicia Lagano): The desperate murder suspect and hostage-taker who believes she is being framed. [S6E4] Number One Fan
is the fourth episode of the sixth season of the crime-drama series Castle , which originally aired on ABC on October 14, 2013. The episode follows a high-stakes hostage situation that centers directly on the show's titular character, Richard Castle. Plot Overview (Stana Katic): Castle's fiancée, who at the start