: The episode was written by Terence Paul Winter and directed by John Terlesky.
(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.
: By the end of the episode, Beckett officially regains her job with the NYPD, ending her brief period of unemployment following her firing from the FBI. Castle season 6 episode 4 review: Number One Fan [S6E4] Number One Fan
(Tom Amandes): A wealthy businessman who is revealed to be Emma's biological father. Production & Significance
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 : The episode was written by Terence Paul
: This episode is notable for being the first time Castle is actually shot; he survives thanks to his "Writer" bulletproof vest.
As Castle enters the clinic to negotiate, he begins to believe Emma's story despite incriminating evidence found at the crime scene, such as a murder weapon from her own kitchen and suspicious text messages. While Castle works the inside, Detective Kate Beckett and the rest of the team investigate from the outside to uncover the true killer. Key Characters & Cast Castle season 6 episode 4 review: Number One
(Billy Miller): A "hot-headed" Wall Street banker and one of the hostages who repeatedly tries to take matters into his own hands.