XY
Season 8, Episode 1 TV-PG
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Castle and Beckett are adjusting to Beckett’s career change, when a call from a mysterious stranger sets off an explosive chain of events.
XX
Season 8, Episode 2 TV-PG
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After receiving a mysterious tip from her past, Beckett is launched into a fight for her life, with a team of mercenaries hot on her trail. As Castle investigates why his wife is on the run, Beckett must figure out who wants her dead, before they can finish the job.
PhDead
Season 8, Episode 3 TV-PG
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When the body of a local college fraternity student is found gruesomely murdered, Castle has to go undercover as a professor in order to gain access to the victim's world. However, he and Beckett soon discover that behind the fun and games of college are some darker secrets the university wants to keep hidden.
What Lies Beneath
Season 8, Episode 4 TV-PG
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When Castle's idol, a famously reclusive author, turns up dead, Castle is determined to solve his hero's murder. But as he and Beckett dig deeper, they discover that truth is stranger than fiction.
The Nose
Season 8, Episode 5 TV-14
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When a priceless work of art is stolen and its transporter murdered, Castle and Beckett must work with the key witness to track down the painting and sniff out the killer.
Cool Boys
Season 8, Episode 6 TV-PG
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Detective Slaughter returns to enlist Castle's help in solving a high-stakes robbery case. But when a body is found linked to the crime, Slaughter becomes the number one suspect in the heist turned murder, while Castle has to determine whether he's guilty or help to prove he's innocent.
The Last Seduction
Season 8, Episode 7 TV-14
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In order to hunt down the brutal murderer of a grifting seducer, Castle and Beckett must investigate New York's elite. Meanwhile, Castle plans to surprise Beckett on their one-year wedding anniversary.
Mr. & Mrs. Castle
Season 8, Episode 8 TV-PG
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In the winter finale, Castle and Beckett investigate the murder of a cruise ship entertainer, only to find themselves trapped at sea with the killer.
Tone Death
Season 8, Episode 9 TV-PG
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When a body is found in the theater of Martha’s latest show, Castle and Beckett’s investigation leads them into the unexpectedly dangerous world of competitive a cappella.
Witness for the Prosecution
Season 8, Episode 10 TV-PG
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Castle finally gets his day in court when he takes the stand as the key witness to a murder from five months ago. But when new information suddenly arises, he and Beckett must race against the clock to prevent a miscarriage of justice.
Dead Red
Season 8, Episode 11 TV-PG
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When the son of a Russian diplomat turns up murdered, Beckett and Castle find themselves in a dangerous game of international crime and punishment.
The Blame Game
Season 8, Episode 12 TV-14
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Castle is captured and forced to work with strangers to solve deranged puzzles and mind games, while Beckett and the 12th Precinct race against time to rescue Castle and catch a killer.
And Justice For All
Season 8, Episode 13 TV-14
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Beckett and the 12th Precinct look into the murder of an English as a Second Language student. When the victim's class won't talk to the police, Castle goes undercover as a French Canadian immigrant and learns the victim was more than he seemed.
The G.D.S.
Season 8, Episode 14 TV-14
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Castle returns to the City of Angels in search of answers about his missing time, but things take a deadly turn when he's recruited by the legendary Greatest Detective Society to help solve a murder.
Fidelis Ad Mortem
Season 8, Episode 15 TV-14
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When a recruit officer at the NYPD Academy is killed, Beckett and the team go back to their old training ground to investigate. Meanwhile, Castle must reckon with a decision with profound consequences for him and Beckett.
Heartbreaker
Season 8, Episode 16 TV-14
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A clue at the scene of the death of an armored-car driver leads Beckett and Castle back to an old case solved by Esposito. Complications arise when they learn Esposito might not have been telling them everything about his relationship with the culprit.
Death Wish
Season 8, Episode 17 TV-14
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The murder of a man connected to smuggling Turkish relics sends Castle, Beckett and the 12th Precinct on a search for a stolen antique believed to be Aladdin's lamp, in hopes that it can lead them to the killer.
Backstabber
Season 8, Episode 18 TV-14
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After Hayley does a favor for an old friend, she finds herself implicated in a killing and cyber-terror attack. Now, Beckett and Castle must rush to solve the case and clear Hayley's name.
Dead Again
Season 8, Episode 19 TV-14
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A mild-mannered safety inspector for the city miraculously survives a poisoning by sheer luck; but when he survives another, it's a mystery for Castle and Beckett to solve.
Much Ado About Murder
Season 8, Episode 20 TV-14
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After a movie star turned theater actor is mysteriously killed, Castle and Beckett go backstage in search of the murderer.
Hell To Pay
Season 8, Episode 21 TV-14
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When an axe-wielding, escaped psychiatric inmate drops dead in Castle's P.I. office, Castle and Beckett's investigation leads Castle to suspect the victim's death could be the work of the Antichrist.
Crossfire
Season 8, Episode 22 TV-PG
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With their best lead in hand, Castle and Beckett are ready to take on LokSat. But an unforeseen twist puts their case – and their lives – in jeopardy.
Season 8 Inside Look
Season 8, Extra TV-14
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Castle was finally found after missing his wedding to Beckett and disappearing for two months. With no memory of this lost time, will the truth of Castle's missing months come back to haunt the newlyweds? After passing the Captain's exam, Beckett was surprised with the news that she was also being vetted for political office. Which path will she choose, and how will New York's famous couple adapt?