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22 Episodes 2015 - 2016
Episode 1
Mon, Sep 21, 201543 mins
Castle can barely enjoy his cool-renovated office or control Alexis' self-righteous incursion into his PI-business, as Kate goes missing. He finds the inscribed bracelet he just gave her at the scene of a triple murder of apparently unconnected men. He promises to keep the NYPD out for the collaboration of obnoxious, insurance-employed English ex-cop Hayley Shipton, who came to investigate a five-fold identity theft. The trail leads to evidence that Kate wasn't abducted but kept others at gunpoint, and it all connects with cahoots of her mother's murderer, jailed senator William Bracken.

Episode 2
Mon, Sep 28, 201544 mins
Beckett is on the run with Vikram Singh, the CIA analyst who discovered the identity thefts and their purpose, and under mercenary attack, but gets pulled out by Castle's top-secret agent step-mother. Hayley, confessing guilt, rejoins castle and Alexis. It becomes clear the assailants belong to former senator William Bracken's mighty conspirators, but he's murdered in jail and just about everyone's loyalty is found questionable. Becket decides to spare Castle's family needless risks, against his choice, by going her own way again.

Episode 3
Mon, Oct 5, 201543 mins
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.

Episode 4
Mon, Oct 12, 201544 mins
Blind Catholic priest Arguello identifies the man murdered in his church as Castle's famously reclusive idol, a one-hit great American novel author. Beckett, reluctantly, admits she needs Castle's knowledge of City Hall when they run out of suspects. The author's multiple pseudonyms, 'for long participatory research purposes', including a mob hit-man, lead to infidelity and fraud. Meanwhile, Ryan and Esposito each hope to supplement their meager family budgets via the NYPD Sergeant exam.

Episode 5
Mon, Oct 19, 201544 mins
A transporter is murdered to steal a priceless Van Gogh. Castle wriggles into the NYPD investigation by using Mia Laszlo, the only witness, and her hyperosmia (extreme smell sensitivity). The plot thickens as there is a counterfeit involved, and an obsessive family inheritance factor. Meanwhile, Esposito makes sergeant, but Ryan failed the exam and accidentally keeps hurting his partner, who suspects jealousy.

Episode 6
Mon, Nov 9, 201542 mins
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.

Episode 7
Mon, Nov 16, 201542 mins
Actor Scott McCoy is stabbed 9 times in his home. Castle is asked to join the team as a 'buffer' between bickering Ryan and Esposito. He is also determined to spend time with Beckett on their first anniversary.During the investigation, they find Scott and his wing-man Anton Ford deliberately seduce wives to get compromising photos for use in divorces. Castle secretly finds out that Beckett is keeping something from him.

Episode 8
Mon, Nov 23, 201542 mins
Castle and Beckett investigate the murder of a cruise ship entertainer, only to find themselves trapped at sea with the killer.

Episode 9
Mon, Feb 8, 201642 mins
When a corpse is discovered in the theater of Martha's latest show, Castle and Beckett's investigation reveals suprising details about the world of competitive a capella.

Episode 10
Sun, Feb 14, 201642 mins
Castle testifies as sole eyewitness in the murder case against the caterer at Roger and Joanna Masters' society party, where he was doing a book reading for charity. When the incompetent public defender who was on the case gets ill, Caleb Brown, who is suspected of working for LokSat, takes over and makes Castle admit he could be wrong. To cover for this and to shore up the case, Castle and the 12th precinct urgently re-check the evidence looking for alternative motives. What they find leaves Castle in doubt about what really happened.

Episode 11
Mon, Feb 15, 201641 mins
Grigory Mishkin, son of Russian consulate diplomat Sergei, is murdered. Castle gets to investigate, closely 'accompanied' by domineering Russian 'security guard' Vasiliy Zhirov, apparently an spy, who has excellent contacts at State Department and is discretely part of Becket's secret team. They discover that Grigory was killed to prevent him disclosing a larger plot, which still leads to a sniper murder attempt, and dig into further secrets, while one more awaits Castle.

Episode 12
Mon, Feb 22, 201642 mins
While Beckett's team investigates the murder of Emma Matthews, Castle is abducted with several, even more puzzled, men to a locked room where they are challenged by cruel, sick games and puzzles, each puzzle promising a step closer to freedom. Then they are shown an identical room where Becket and women dear to his companions wrestle with similar challenges. While Esposito, Ryan and Alexis independently work the related murder and searching for their missing friends, Castle and Beckett, as natural leaders, try to keep their fellow captives calm and focused.

Episode 13
Mon, Feb 29, 201642 mins
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.

Episode 14
Mon, Mar 7, 201643 mins
While in LA to find out more about when he was missing, Castle is greatly flattered to be invited to a meeting of the Greatest Detective Society. On arrival, he finds that, to become a member, he must solve the murder of a member before Kendall Frost. At the same time, with the help of Alexis and Hayley, he is tracking down the clues to what happened during the months he can't remember, starting in Koreatown where his last flash-back memory has led him. But, end the end, he must come to a decision as to just let it go, as his past self seems to want him to, or continue despite the possible consequences.

Episode 15
Mon, Mar 21, 201643 mins
The killing of a police rookie with an NYPD academy service gun is tied to the present class's female top student, so Becket, the best ever, goes undercover. The trail points to the Irish mob and a mole, who tie in trough love. Meanwhile Castle decides after long hesitation to read the message to himself he warned against and next to tell Becket it points to her nemesis.

Episode 16
Mon, Apr 4, 201643 mins
After an armored car driver is killed and some of the money it was carrying stolen, details of the heist start to ring a bell for Esposito regarding a previous theft of gold coins nine years earlier. Also, Beckett officially moves back in with Castle but is starting to feel that Castle's home network AI, Lucy does not have as much love for her as he does.

Episode 17
Mon, Apr 11, 201642 mins
Castle and Beckett fully enjoy conjugal life again. The team investigates the murder of a man who was digging in Turkey for what seems to be Aladdin's lamp and smuggled it home to Manhattan. Castle speculates the person who keeps crossing his path seems the magical ghost while they find the secretive accomplice murdered, too.

Episode 18
Mon, Apr 18, 201643 mins
After planting a spy bug for a private job, Hayley sneaks off while her partner Marcus Janek stays hidden to spy on the lovers couple in another office that nearly caught them. Next morning, team Castle, with Hayley tagging along, investigate a murder in the same building and find the victim is Marcus. Hayley stays silent as long as possible but must come clean when another murder is found. Meanwhile, the case is found to involve cyber-terror in London and MI6 dispatches agent Steven Mallory, who duly treats her as prime suspect.

Episode 19
Mon, Apr 25, 201642 mins
New York City safety inspector Alan Masters inexplicably survives a poisoning already ruled fatal by Lanie's examination. Despite police protection, he's electrocuted in his bed, again called dead but very alive. Castle takes Alan home but can't resisting coaching him to date a foxy girl from the research lab he's secretly admiring, but she instantly accepts a dinner date, where a mob killer arrives to offer him 'protection'. Vikram Singh finds out that LockSat met with Caleb Brown.

Episode 20
Mon, May 2, 201642 mins
Action movie star Zane Cannon was murdered while rehearsing Hamlet, a play with co-star Naomi Fox directed by Erin Cherloff, both seriously reputed. The team soon finds links with Zane's ex-con stepbrother, Johnny Toro, Guadalajara drug cartel-baron, Jorge 'El Oso' Zamacona and his so far clean-reputed brother businessman, Hector. Castle gets snatched by Jorge, who demands a script recounting his life. Meanwhile the Broadway scene is proven far from innocent.

Episode 21
Mon, May 9, 201642 mins
During a blackout, Castle and Beckett investigate the death of mental asylum patient Gabriel Shaw, who arrived at Castle's PI office carrying an ax. Shaw, apparently, believed his divine mission was to stop the Antichrist. Castle fears a demonic threat while the team looks into the asylum, a missing orderly, tycoon Victor Crowne, whom Shaw tried to murder as a child, and Oscar von Eckland, heir to another Antichrist-fighter.

Episode 22
Mon, May 16, 201642 mins
Vikram finds out that Caleb is about to meet Loksat's accountant to deliver a memory stick, so Castle and Becket decide to set a trap, leaving the detectives to investigate a burned corpse in a car trunk, which is later identified as Caleb. Castle and Beckett have walked into a trap, but are rescued by the Greatest Detective Society president, Mason, who promises to only babysit them, not help chase Loksat. By the time the NYPD duo finds out about Loksat and insist on joining their quest, the couple has walked into Loksat's trap for the purpose of finding out about and tying up loose ends to secure his anonymity,
