Castle and Beckett are engaged. Beckett starts FBI training in Washington D.C. and is assigned to a case. Someone broke into a secured building and may have stolen codes. Castle flies to D.C. and is exposed to a deadly toxin. The code theft was a diversion. Written by Bernie

The FBI continues to track leads to the person who stole the deadly chemical. It is a race against time, since they need the antidote for Castle who has been infected with the chemical.

Perhaps partially annoyed by Alexis's ever-present lover-house-guest Pi's health food obsession, Castle is ready to move to DC so he can be with Becket again. For now, he's torn between loyalty to his own curiosity and the NYPD boys, who are breaking in junior detective Grant 'Sully' Sullivan, expecting he gets information from Becket, and her need to preserve mandatory secrecy when the FBI is ordered to take over a New York murder without specifying the 'national security' aspect. Victim Charlie Reynolds, a has been high-school soap star whom Ryan adores openly, had a complex relationship with co-star Ramon Russo, now an acting teacher, who hoped to return to the screen as the series was promised a movie revival. New co-star Svetlana Renkov,d daughter of a Russian mob king, is key to the money behind film and criminal hidden agenda. Written by KGF Vissers

Ex-cop Angelo Vasquez, reformed since ten years but unemployed, was murdered in the home of his fiancée, Emma Briggs. She ran, took hostages in a dentist practice and asks only for Castle, whom she claims to trust, unlike the police, to prove her innocence of the murder. Becket now is the one officially out of the loop, yet allowed to work with the team. They find out incriminating elements from Emma's past, yet castle keeps finding interpretations potentially in her favor while believing in her being framed, so elaborately it requires brains and clout, which both turn up. Written by KGF Vissers

A grisly murder investigation leads Castle and Beckett to a suspect who claims he's traveled back in time to stop terrible events from unfolding, events that will change the course of human history. Is he simply a deluded killer, or is it possible that he's telling the truth. Written by ABC Publicity

A woman was fatally stabbed with a colonial type of sword, apparently a ritual murder. She recently took a great, atypical interest in the occult, but that was just for a fund-raiser scavenger hunt organized by the professor chairman of the historical society. Security cameras recorded her being followed by an ex-con Franciscan to a church where clues abound to both mysteries, even tie in with her family's early history and lore concerning a real treasure. Written by KGF Vissers

15 years ago a boy was charged guilty for having killed the girl across the street. Today he stands in court one last time to hear that he has three days left to live before his execution. This is because of lack of evidence. Alexis, who has followed this case a while, has determined the man isn't guilty and gets help from her father to do all they can as private citizens to solve the case and turn innocent Frank to his freedom. Written by Oddvar Elgvin

Castle and Becket bicker about compromise regarding a shared living space while investigating the murder of a famous author and the unofficial relationship therapist of the New York jet-set. It looks like VIP clients, such as the discreetly divorce-planning Warner couple, who hired an ex-con private detective, wanted to protect their secrets. But the team finds out she actually held her own secret and a giant flawless diamond, worth an insane fortune and even an armed attack in daylight on Ryan and Esposito. Written by KGF Vissers

Separately, a man and first a woman are torturous strangled with steel fishing wire, the bodies made to resemble Esposito viz. Lanie well before. They have no apparent connnection, except to a soon disappearing plastic surgeon, and all of them to Florida, as goes for the next bodies. By the time Castle realizes the whole MO fits only a serial killer presumed dead, he has already executed his plan in the precinct. Written by KGF Vissers

A bleeding man stumbles into a church, but just before dying, he hands a mysterious bundle to the priest. When the bundle turns out to be a smiling baby boy, Castle and Beckett find themselves accidental nannies to the newborn. But when they determine the baby and the victim were not related. Written by Anonymouse

When Castle and Beckett discover that the victim of a building fire was actually shot to death, they get on the trail of a serial arsonist turned murderer. Meanwhile, Ryan's wife, Jenny, goes into labor, but disaster threatens to ruin the joyous moment. Written by Anonymous

Ted Rollins, employee at a huge sum transactions firm, is murdered at home. He lived way above his pay-grade and financially supported his father and brother generously, no doubt secretly having resumed hacking, despite a court ban to use ICT after a teenage 1,4 million 'robin Hood' theft. Castle's father, top spy Jackson Hunt, warns Richard and his bride, with whom he's planning wedding and honeymoon, against taking the case, refusing to disclose why it's too dangerous. Written by KGF Vissers

The 12th Precinct takes the case of Mandy Sutton, a teenage pop star, whose rise to fame brought with it media attention and anti-social behaviour. Meanwhile, Beckett experiences the perils of being married to Castle first-hand when her newfound celebrity status makes their relationship a target for the tabloids. Written by Neuronical

Ella Hayes, PA of the leading fashion magazine's tyrannic CEO Matilda King, is found in a dumpster, strangled with a blue scarf. She and her colleague were fired shortly on account of messed-up appointments, which turn out to be the work of a hacker, while Ella's apartment was bugged by Matilda's security chief. Traces also lead to top lawyer James Kavanaugh, to his client, the main rival magazine, to rising designer Yumi and even to King's right hand Julian Bruckner, as the magazine's recent take-over started a paranoia and Ella offered a damning secret. Meanwhile Castle stumbles on the perfect wedding venue, but Kate gets early bridal stage fright. Written by KGF Vissers

Castle and Beckett investigate the death of a mean high school girl at one of Castle's alma maters. Castle is thrilled when he discovers that it might be the work of a teenage telekinetic.

Castle and Beckett are baffled when a confused woman with an unshakable alibi gives a detailed and convincing confession to a murder. Then a second person walks into the precinct and makes the same confession. And then a third.

Beckett is recruited to assist on a Narcotics investigation, but a routine mission turns deadly when an undercover operation goes awry. To survive, Beckett must engage in a battle against some of the most dangerous men in the New York underworld - including a powerful enemy from her past. Written by Anonymous

Investigating the killing of a Japanese ballerina, Castle and Beckett find a shrine with the murder weapon in an old factory. Then, when the two are separated, Castle is ambushed by a hooded attacker bearing all the hallmarks of a ninja.

Investigating the death of a Wall Street trader leads Castle and Beckett to discover that the victim was an undercover informant for the U.S. Attorney's office.

When construction workers uncover a mobster's body buried in concrete for 35 years, Castle and Beckett must try to talk to a fellow mafioso so stricken with grief that he lives as a recluse in a Seventies time-warp.

Skateboard pro Logan Moore was killed while visiting New York for a major tournament. Only main rival Manny Castro seems to benefit, but the team also find links to Enver Kotta's Albanian mob, earlier and recent crimes and Brett Zaretsky's prestigious law firm. Meanwhile Ryan and Esposito rival to become Castle's best man, but don't even know how that's to be decided. Written by KGF Vissers

Kate Beckett is following a man she believes is related to the death of her mother. The man turns up dead the next morning. They discover that the man was killed by Vulcan and when his body is discovered, Beckett is framed for that murder. Her only hope is to discover a cassette recording that will help her solve the case and prove her innocence. Castle and the entire team at the precinct must help her or go down with her. Written by SwatiG

When Castle and Becket apply for their marriage license they find out that Becket is already married. They have to track down the husband and get him to sign divorce papers, but two groups of armed thugs also want him. Meanwhile, back in New York, multiple calamities strike that could delay the wedding, but Alexis, Lanie, and Martha find creative solutions. Finally, Becket is at the church waiting for Castle. Written by Dr. Bits