On his way to his wedding, Castle's Mercedes crashes and burns out. He however was dragged out, apparently kidnapped, disappears for weeks, but is found in drifting unconscious at sea with amnesia. A camera proves he at least helped stage and financed his abduction. The team starts doubting his sincerity, like FBI agent Connors. A soon as Castle is healthy enough to join the search, he proves evidence was planted against him. Written by KGF Vissers

When the CEO of a prominent toy company is found murdered, the team uncovers an interesting secret about the victim; Castle tries to figure out what happened in those 2 months he was missing, and takes Alexis with him to Montreal when his investigation takes him there.

Pool hustler William Fairwick is found at home, fatally stabbed with a broken cue, which seems to fit threats from at least one victim. It turns out he actually saved young tycoon Tom Talmadge, who was beaten in hospital but refused to file a complaint because his suspect is an invisible man, he only explanation which fits the security camera footage of Fairwick's own murder. Castle and Becket are themselves attacked by an invisible enemy, yet try resuming their sex-life and link the case to a top-secret government facility, where Will actually was key researcher. Written by KGF Vissers

Castle volunteers in a second grade classroom in order to locate a witness to the murder of an ice cream vendor. After the class draws pictures, he discovers one has drawn a picture of the crime scene. By matching the drawing of the ice cream truck, Castle discovers the witness and helps Kate solve another case. Written by Mr. Ralph

When a web celebrity is murdered, Castle and Beckett explore the flashy world of internet fame, but when the killer posts pictures from the crime scene on a photo-sharing site, they realise they are up against a social media sociopath who may strike again.

Castle goes to an alternate universe where he and Beckett had never met. In this bizarre reality, Beckett was captain of the 12th Precinct and Castle, hadn't had much recent success in writing. In fact, Castle's mother was more famous than the novelist. Written by Hotaru Marote

The only lead to a poisoned female investigative reporter's corpse found in New York is that she recently visited an authentic Old West-style holiday resort in Arizona. Since Becket can't get vacation for the tropical island honeymoon castle booked, they agree to enjoy as such an undercover mission as newly-wed there. They soon find, backed up by local sheriff Conklin and in Manhattan by Esposito and Ryan, although the team sulks about not having had opportunity to attend the wedding, that the victim was on the trail of both her ascendancy and the lost gold booty of 19th century major hold-up. Resort staff provides several suspects. Written by KGF Vissers

While the team investigates the murder of official Brent Reeves, who investigated possible abuses with public contracts, the last person to have contacted him, socially isolated hacker Jared Stone, holds everyone hostage in a metro, including Esposito, demanding a fellow cyber-criminal's release. The asthma-sufferer ends up overpowered, but more, even nastier surprises are in store for him as well as Newyorkers. Written by KGF Vissers

Castle is excessively excited that the next case is the murder of his favorite has been-action movie-star Brock Harmon and speculates that Brock's 'famous' pre-Hollywood past in the Spanish secret service may be the key. The NYPD rather bets on a new action movie he's involved in with his former co-star and son Trey Harmon. Both avenues yield surprises. Written by KGF Vissers

When an ER physician is gunned down in the street, Castle and Beckett soon discover that the victim was a mob doctor to a Mafia family run by an old friend of Castle's. Also, against this backdrop of Christmas, Esposito and Lanie reach a defining moment in their relationship.

Due to his 'mob connections', Castle is barred from official cooperation with the NYPD, so he passed the private detective exam and pops up 'independently' in his mates' next case. Kate and her team however are tempted but not allowed to team up with him, even if he proves more resourceful than all their resources, which also puts a strain on marital peace. Written by KGF Vissers

After a young telenovela actress is killed, Beckett and the 12th Precinct are thrown into the world of glamorous television; meanwhile, the mysterious star of the show contacts Castle separately to work as a Private Investigator on the murder.

Castle is hired to uncover whether a client's husband is having an affair, but the case takes a shocking turn when Castle witnesses the client's murder - by her husband. But with no proof that the killing took place, Castle and Beckett must investigate to expose the truth. Written by ABC

A meticulous MO for victims linked apparently only by plastic surgeon Kelly Nieman, a suspected serial killer herself, who gave the unwitting women identities fitting an archetype arouses the eerie, confirmed feeling that serial killer 3XK is back, aiming at his abusive mother's type. Castle is hired as police consultant for this case, being the absolute expert in the fiend. While he and the team work through their charades and legal defenses, one of their own is targeted. Written by KGF Vissers

NYPD is in search of Beckett while 3XK calmly plays with them.

Castle is delighted to help investigate the murder on a 'Mars astronaut' in a New York simulation site. The team must figure out how it as done, actually using the landing craft, and who gained access, plus the motive, so they scrutinize the astronauts team and drop-out, site crew, ICT tycoon owner, grim rival and relevant loved ones. Written by KGF Vissers

A Hong Kong Detective works with Beckett and Castle on the murder of an ex-con turned tow truck driver.

Ryan isn't even allowed to tell his cop team who he's guarding while moonlighting in his ex-cop brother in-law Frank Kelly's security firm. That changes when NYPD is called in to investigate in a hotel the fatal shooting of Carolyn Decker, a key campaign staffer of and standing next to Congressman Alex Lopez, who is tipped as first Latino presidential top candidate. The team concentrates first on 'patriot' anti-government-activists and other enemies of Lopez, and Frank's dodgy part, but ballistics show Carolyn probably was the target herself, so the focus shifts to the campaign team itself. Written by KGF Vissers

Beckett and Castle are faced with a large list of possible suspects when a personal injury attorney known as Richie The Pitbull Falco is murdered; a shocking secret deepens the mystery surrounding Richie's death.

A mysterious recurring dream drives Castle and Beckett to seek answers about the two-months he was missing. But their search for the truth has deadly consequences.

As Castle and Alexis travel to London, their routine flight turns deadly when the plane's Air Marshal is found murdered. With the help of Beckett on the ground, Castle and Alexis race against time to find the killer before he carries out his fateful plan.

The creator of a sketch-comedy show is murdered, and the investigation yields a surprising secret.

A death occurs in the woods and Castle becomes obsessed with the case because it reminds him of a pivotal event in his childhood. Beckett reaches a turning point in her life.