'Castle' spoilers: A hostage crisis brings Billy Miller and Alicia Lagano

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"Castle" Season 6 continues to bring in the guest stars -- Billy Miller and Alicia Lagano have been cast in episode 4, a story focusing on a hostage crisis. "Number One Fan" is expected to air Oct. 14 on ABC.

Lagano ( "The Client List") will play a character named Emma Briggs (as reported by TVLine). She is described as a fugitive from the law, even before she takes a group of people hostage. Strangely, Emma will not talk to the police: She only wants to speak to Richard Castle ( Nathan Fillion).

Why is that? GiveMeMyRemote quotes "Castle" executive producer Andrew Marlowe for the answer: "Castle is enlisted in a hostage crisis as a negotiator because the woman doesn't trust police, and she's kind of his number one fan," he explained.

Just who are these hostages that need Castle to save them? Miller ( "The Young and the Restless") is one of them, a quick-tempered Wall Street banker named Mickey Gerhardt (according to Soaps in Depth). Considering the man's temper, he might not do so well when things get tense.

Photo/Video credit: ABC