ABC’s Castle delivered one of its most suspenseful hostage dramas with Season 6 Episode 4 (S6E4 / 6×04), “Number One Fan.” Originally airing on October 14, 2013, the episode begins when Emma Briggs, a desperate young woman accused of murder, takes a group of strangers hostage inside an apartment building. Refusing to negotiate with the police, Emma insists she’ll only speak to one person—Richard Castle. With innocent lives hanging in the balance, Castle and Beckett must determine whether Emma is truly a dangerous killer or a frightened woman caught in a much larger conspiracy.
Written by Terence Paul Winter and directed by John Terlesky, “Number One Fan” places Castle in an unfamiliar role as both hostage negotiator and amateur detective. Rather than solving the case from behind police tape, he’s forced inside the crisis itself, relying on his instincts to earn Emma’s trust while Beckett and the NYPD race to uncover the truth before the situation turns deadly. The episode blends intense psychological suspense with the series’ signature mystery, creating one of Season 6’s most memorable standalone stories.
Led by Nathan Fillion and Stana Katic, the episode features standout guest performances from Alicia Lagano as Emma Briggs and Billy Miller as fellow hostage Mickey Gerhardt. Their performances help elevate the emotional stakes as Castle finds himself personally invested in proving Emma’s innocence before time runs out. Below, you’ll find promotional photos from Castle Season 6 Episode 4, “Number One Fan.”
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CASTLE Season 6 Episode 4 Number One Fan Photos
Thomas Miller is the founder and Editor-in-Chief of Seat42F, covering television, movies and streaming entertainment. He launched Seat42F in 2007 and has spent nearly two decades covering the entertainment industry.
