(Tom Amandes): A wealthy businessman who is revealed to be Emma's biological father. Production & Significance
: The episode was written by Terence Paul Winter and directed by John Terlesky. [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 (Tom Amandes): A wealthy businessman who is revealed
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 The episode follows a high-stakes hostage situation that
: This episode is notable for being the first time Castle is actually shot; he survives thanks to his "Writer" bulletproof vest.