[s6e4] Number One Fan Apr 2026

: 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

(Billy Miller): A "hot-headed" Wall Street banker and one of the hostages who repeatedly tries to take matters into his own hands.

(Tom Amandes): A wealthy businessman who is revealed to be Emma's biological father. Production & Significance [S6E4] Number One Fan

(Alicia Lagano): The desperate murder suspect and hostage-taker who believes she is being framed.

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 : By the end of the episode, Beckett

: 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. Key Characters & Cast : The episode was

: This episode is notable for being the first time Castle is actually shot; he survives thanks to his "Writer" bulletproof vest.