A desperate murder suspect with a hostage insists on negotiating with Castle.
Agents Beckett and McCord arrive to take over Castle and the guys' investigation into the death of a former child star, creating tension in the precinct.
Beckett races to find a stolen toxin capable of killing thousands of people; Castle has less than 24 hours to live after being exposed to the chemical weapon.
Beckett and Castle face the consequences of their decisions during a high-stakes investigation.
This Season Pass includes all current episodes and will include future episodes after broadcast date as they become available. Season six begins where season five left off. Will Beckett accept Castle's proposal?
An interview with a federal law enforcement agency forces Beckett to reconsider her career and her relationship with Castle; a young woman's body is found inside a flop house's water tank.
When a government whistleblower is murdered, Beckett and Castle must figure out who is responsible and determine why Homeland Security is trying to take over the case.
When Beckett steps on a pressure-sensitive bomb, the team searches for a way to save her while Castle distracts her by talking about their relationship.
When Beckett is tasked with protecting a charming billionaire whose life is in danger, she reflects on her relationship with Castle; consumed with jealousy, Castle tries to solve the case as quickly as possible.
Beckett and Castle discover giant footprints at the site of a vicious murder, leading the team to wonder if Bigfoot is the killer.
While stuck at home with a broken leg, Castle believes he witnesses a murder in the apartment across the street.
When a body is discovered in an industrial cake mixer, the murder is traced to an Irish gang and a bar owner named Siobhan O'Doul (Cara Buono); Detective Ryan reveals a history with Siobhan from his time working under cover in narcotics.
Castle and Beckett tackle one of their creepiest cases yet when a woman appears to have been scared to death by a "haunted" DVD; Castle fears for his life after he accidentally watches the video.
After the FBI fails to get Alexis back, Castle takes matters into his own hands; Castle learns that his daughter's kidnapping may be a part of a larger and more sinister agenda.
A murder investigation reveals a plot to kidnap a wealthy businessman's daughter; FBI Agent Harris (Dylan Walsh) helps Castle and Beckett investigate.
The young rising star of "The Wives of Wall Street" is murdered; Castle tries to give Beckett a Valentine's Day gift, but his plans go awry.
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