[s6e4] Number One Fan -

: The episode was written by Terence Paul Winter and directed by John Terlesky.

: 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

(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. : 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. : This episode is notable for being the

A young woman named (played by Alicia Lagano) wakes up to find her boyfriend, Angelo Vasquez, murdered in her apartment. Panic-stricken and fleeing from the police, she ends up in a dental clinic where she takes several people hostage. Emma refuses to negotiate with the police, insisting on speaking only to Richard Castle. She claims to be a fan of his work and trusts only him to prove that she has been framed for the murder.

(Tom Amandes): A wealthy businessman who is revealed to be Emma's biological father. Production & Significance

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