[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

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

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 [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.

(Tom Amandes): A wealthy businessman who is revealed to be Emma's biological father. Production & Significance is the fourth episode of the sixth season

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

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. As Castle enters the clinic to negotiate, he

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