After a serial killer starts displaying the victims the way done in Richard "Rick" Castle's books, Castle teams up with Detective Kate Beckett to solve the case. He then starts to shadow her for his new book.

Castle's first case with the NYPD has him and Beckett solving the case of a nanny found dead in a spin dryer.

A clique of rich kids plays Russian Roulette with a bullet-less gun. But one night, a bullet in the chamber kills one of them. When another one supposedly commits suicide, it's up to the team to discover what is what and if the suicide was over guilt.

Two guys find a rug at a neighborhood dumpster. When they get it home, they were astounded to find a councilman's body inside the rolled up rug. Was this a botched robbery or does this murder have ties to local politics?

A frozen female corpse discovered at a new construction site transforms a cold five-year-old missing persons case into a current homicide investigation.

A ritualistic killer is on the loose while Castle's first ex-wife and Alexis's mom, Meredith visits.

Castle is anxiously awaiting the public response to the release of his newest work of fiction. A baffling rash of jewel robberies from the society set prompts Castle to ask Beckett to be his undercover date at a ball to see if the thief might be amongst the affluent set and casing out his victims at charity events, balls, and parties.

A woman found drowned in a bathtub full of motor oil is initially identified as a missing suburban housewife, until it's discovered that her identity had been stolen from a deceased child, and that she had been a fugitive from a terrorism charge for two decades.

A 2-year-old girl is abducted reuniting Beckett with her ex-boyfriend, FBI agent Will Sorensen.

A plastic surgeon is found murdered with his fingernails ripped off. Castle looks into Beckett's mother's murder despite her protests.

A case involving an insurance agent brings Castle and Beckett, who are still on the outs after he looked into her mom's case, back together.

Two murder victims are found prompting Castle and Beckett to bet against Esposito and Ryan to see who solves their case first.

Castle and Beckett get an inside look at the cutthroat world of the New York fashion industry when they investigate the brutal murder of a young model during Fashion Week.

When an Arctic explorer is killed during a polar expedition, the mysterious circumstances of his death take Castle and Beckett from the penthouses of Park Avenue to the halls of the CIA. But Castle's delight at the case's many twists and turns soon turns to frustration as he realizes that their elusive killer might just be fooling them all.

Illegal Czech immigrant Eliska Sokel's corpse is found hidden in a sewer, two days after her death. Her also-illegal ex, Teodor Hajek, explains she left him after their son died from a congenital disease. She had worked on the concierge staff of a luxury residence but was fired after Dr. Cameron Talbot's wife questioned the appropriateness of her treating their son Zane to a lollipop. Castle wonders how Beckett will take his dedication of a book starring her alter-ego, and his agent Haas's offer of a contract to write 3 British spy novels. They still solve the case after unearthing an old, tragic secret.

A case near Halloween has Castle and Beckett investigating the death of a man in a graveyard, wearing fangs.

A singer is found dead, hanging upside down on a fire escape. Ultimately, it's Alexis who helps solve the case.

A bike messenger gets hit by a car and his carrier bag stolen. The bag contained evidence pertaining to an old case that Montgomery worked on.

Highly respected A.D.A. Jack Buckley, a tough crime-fighter, was murdered. His ex-brother-in-law Paul Cho, a businessman who likes call girls, was blackmailed by Danton to tell Buckley to back off. Castle and Beckett discover it's all about the discreet cyber-prostitution business, which happens to employ Buckley's legal protégée, Scarlett Price. Working out who took over the 'Danton' franchise when founder Dan Tonelli is jailed, leads to some surprising revelations. Meanwhile, 'cool dad' Castle worries about what secret Alexis shares only with Beckett.

A man leading a double life is found dead in a garbage chute.

When an art dealer is gunned down in his gallery, Castle & Beckett discover that a bullet is inexplicably missing from the crime scene. The mystery is deepened by an amnesiac who witnessed the crime but can't remember what he saw or even who he is.

A death of a bridesmaid reunites Castle with his long lost love.

While investigating the death of an Irish mobster, Beckett and Castle uncover a local turf war that may be connected to both a late-night infomercial guru and an international drug smuggling operation. But the case turns agonizingly personal when evidence emerges that the killer they're chasing may have had a hand in Beckett's mother's murder.

Mysteries abound when a family returns from vacation to discover a dead man in their daughter's bed. Thinking they're investigating the murder of a squatter, Castle and Beckett soon find themselves unraveling a multi-million dollar heist. Meanwhile, Castle tries to keep Beckett from finding out that they've been romantically linked when he's featured as one of New York's 10 most eligible bachelors.

A baseball player is found dead in Spanish Harlem. It's found that he had many people hating him because he went to Cuba and shook hands with Castro.

A naked woman is found bound and hanging from monkey bars. Castle and Beckett look into the world of dominatrix.

In a two-part storyline, Federal Agent Jordan Shaw, an insightful and accomplished Federal investigator, teams up with Castle & Beckett to hunt down a cunning and elusive serial killer.

The serial killer remains at large and is taunting Castle, Beckett and Jordan Shaw to catch him.

The investigation into the shocking death of a museum curator, crushed by a falling gargoyle, takes a bizarre turn when Castle and Beckett learn that he isn't the first member of a recent archeological expedition to die. It turns out there was a legend inscribed over the burial chamber the team unearthed warning that "all who gaze upon the face of the mummy are doomed." Was the curator just the latest victim of "The Mummy's Curse"? And if so, what does that mean for Castle, who snuck a peek at the mummy when no one was looking?

When a talk show host tells Castle someone wants him dead and dies the next day, Castle asks Lanie to prove his death was a homicide.

When an ex-con is tortured to death, Castle and Beckett reveal a shocking connection between a suspect and Esposito's former partner, who presumably died.

The death of a popular chef reunites Beckett with her high school best friend who owns the restaurant the chef worked at.

Beckett asks Demming to join their robbery-homicide case causing Castle to want to solve the case first.

Nothing is as it seems when Castle and Beckett investigate what appears to be the assassination of an intelligence operative. Meanwhile, Beckett's romance with Demming threatens her relationship with Castle, forcing them to confront their feelings for each other.

Beckett hasn't heard from Castle since he left for the Hamptons months ago to finish writing his second Nikki Heat novel, "Naked Heat." The most Beckett, Ryan and Esposito have seen of Castle is a bookstore standee of him advertising an upcoming book signing. So when Beckett and her team burst into a shadowy apartment on the trail of a murderer, the last thing they expect to see is the real-life Castle standing over a dead woman's body holding a gun. As Castle protests his innocence, Beckett has no choice but to arrest him on suspicion of murder.

When a famous psychic is murdered, Beckett and Castle search for her killer while also carrying on a spirited debate on the existence of extrasensory abilities. Evidence mounts on both sides, especially when a letter arrives from the victim, penned the day she was killed and predicting her own death -- or was it written by a clever killer, hoping to throw off the investigation?

When a coded document hidden by a murdered bail bondsman gets Castle's imagination running wild, Beckett must steer the case back to the violent felons who populated their victim's world - only to discover that maybe Castle's crazy theories aren't so crazy after all. Complicating matters is the surprise arrival of Beckett's ex-partner (now a bounty hunter). As the two reunite over a history that Castle has no part of, Castle is forced to watch the relationship take a turn towards the romantic.

When a mathematician is killed by a 200-year-old bullet, Castle comes up with time-traveling theories.

Mysteries abound when pallbearers at a funeral lose control of a surprisingly heavy casket only to have a second unknown woman tumble out along with the original deceased. When Castle and Beckett learn that the victim was a doctor at County Hospital, their investigation takes them into the world of amorous, bed-hopping physicians. Did jealousy turn to murder, or did the doctor's mysterious work outside the hospital lead to her demise? Meanwhile, Castle's relationship with Gina is challenged when she tries to bond with Alexis.

When a beautiful woman is found dead in an alley, all clues point to her being a victim of the notorious Triple Killer. The Triple Killer, or 3XK, terrorized New York City four years ago, then mysteriously disappeared. Now he's back. In a deadly battle of wits, Castle and Beckett race against time to stop 3XK before he claims his next victims.

Responding to an "Officer Down" emergency call, Castle and Beckett's latest case takes a shocking turn when it's revealed that the victim isn't a cop but a male stripper dressed up as one. The murder leads them into the world of male strip clubs, the hardships of struggling actors, and the price that people pay in pursuit of fame. Did our victim's dreams of stardom get him killed, or was there something more nefarious afoot?

A subway worker is found dead after witnessing the kidnapping of a twelve-year-old boy.

Astrophysicist Marie Subbarao (35)'s corpse is found, with all symptoms of fatal explosive decompression. Her ex Ted Carter, a colleague at the institute, has an alibi. An SF author friend also points to Castle's remark that everything seems to point to aliens. However the team's digging leads to FBI agent Westfield, whose agency goes to extraordinary lengths to stop their investigation, yet fails to keep from them Chinese Ung Kyu's involvement.

The death of a bar owner takes Castle and Beckett back in time to the prohibition era.

An actress playing Nikki Heat shadows Castle and Beckett on the death of a matchmaker. Meanwhile, Ryan plans on proposing to Jenny.

When the owner of historic Drake's Magic Shop in New York is found drowned in Houdini's famous water torture tank, Castle and Beckett must delve into the world of magic, magicians and their secrets to find his killer. As part of their investigation, Castle & Beckett meet master magician Tobias Strange. Meanwhile, the magicians aren't the only ones keeping secrets, as a new romantic relationship is revealed for Esposito and Lanie.

The detective on Beckett's mother's homicide case is killed after telling her he has information.

Lottery-multimillionaire Jay Hixton is shot in the heart at home around midnight. He was apparently forced to open his safe. It contained a gun even butler Reginald Easley didn't know about, which was laid besides him, and a bag, which was taken, containing $100,000 cash and a blue dye bomb, which exploded in a maintenance worker's face. Various suspects arise from Hixton's bizarre generosity, his own murky past and his family, an ex and junkie daughter, and even his winning lottery ticket a year ago.

Castle fights to help an old boarding school friend when be is accused of killing his wife.

Recent US citizen Amir Alhabi, an immigrant from Syria, is found dead in a building next to where his stripped cab is found. He and his cousin Jamal were the owners of the cab. Investigation of the cab's GPS shows that Amir picked up a fare earlier in the day, drove in a circle and then let him out at the same spot. The fare is identified as Fariq Yusef, a 'security attache' for the Syrian Embassy. When Castle and Beckett go to investigate a storage locker, identified from a note on Amir's phone, they find a weapons cache and are exposed to radioactive Cobalt 60. Homeland Security Agent Mark Fallon takes charge as Amir used to work in the Syrian weapons program and it is feared he created a nuclear weapon. Suspecting something didn't feel right, Castle, with Beckett's help, contacts Fariq Yusef to get more information. When Agent Fallon finds out, they are both removed from the precinct. Unofficially, they keep looking into tracing a payment to Amir and why he had a camera installed in his cab. This leads to a fake cover-up, shifting focus to cab driver Kevin McCann.

With time running out, Castle and Beckett must put aside their differences with Agent Fallon to avert a city-wide catastrophe.

A writer of a popular soap opera is found dead. Castle and Beckett come across cheating husbands, mistresses, backstabbers and a con artist to find the killer.

Juror #7 Joe McUsic, who runs a halfway house, drops dead of cyanide-poisoning during Otis Williams's high-profile trial for the murder of heiress Lyla Addison. Juror #4 Tony Mueller runs as he believed Otis's cousin, Wardell, poisoned Joe and he'd be next. Wardell claims he is being framed just as the cops are trying to frame Otis. The cyanide came not from the court house vending machine coffee but was released from a capsule. The plot thickens when it was found that Joe McUsic used a bribe to be put into the jury pool. The case is complicated as there doesn't appear to be any link between Joe McUsic, Otis Williams or Lyla Addison.

Castle knows of four pizzerias named "Nick," with various combinations of the predicates terrific and/or authentic. But their owners, bitter rivals, continually sabotage each other with frat pranks. Then a corpse is found in the pizzeria oven, crisped, but killed by previous stabbing. The owner accuses his rivals, but no one is innocent and everyone has a dirty secret. And the victim, a former war correspondent who lost his edge after his daughter died in a car accident, was reporting on them about their "pizza wars." However, he'd also stumbled across the identity of 'urban myth' Cavallo, a drug lord who viciously executes rivals.

When a champion swimmer and Olympic hopeful is found dead in a training pool, Castle and Beckett dive in to investigate his murder, and uncover myriad secrets that might have led to his death.

When Beckett's old training officer is killed, she takes off on a solo mission to find the killer. On the plane she runs into Castle who is flying out to the Heat Wave movie set. She lets him help her catch the killer.

Mysterious murder occurs during a beauty pageant and the suspects are plentiful.

Cop killer Hal Lockwood, whom Beckett visited unsuccessfully in jail for months hoping for a lead in her mother Johanna's closed murder case, is released by a faked order into the general population, where he slices rogue cop Gary McCallister's throat, then is helped by fake cops to escape. Beckett, his likely next target, receives warnings from her father, Montgomery and Castle. Much helped by Ryan and Esposito, the duo work out that there must be a police accomplice and/or mastermind controlling Chuck Ryker, the debt-ridden corrupt jailer who was found murdered at his home.

Castle and Beckett re-evaluate their relationship after spending the night together.

After tracking a killer to his apartment, Beckett steps on a bomb trigger and must stand in place while the bomb squad finds a way to defuse it. Castle stays with her, and they argue over who liked who first, via flashbacks.

A man Beckett has been secretly following is found dead - and then a notorious criminal involved in the first death is killed with Beckett's own gun. Faced with an elaborate frame-up, she has no choice but to run.

Cop killer Hal Lockwood, whom Beckett visited unsuccessfully in jail for months hoping for a lead in her mother Johanna's closed murder case, is released by a faked order into the general population, where he slices rogue cop Gary McCallister's throat, then is helped by fake cops to escape. Beckett, his likely next target, receives warnings from her father, Montgomery and Castle. Much helped by Ryan and Esposito, the duo work out that there must be a police accomplice and/or mastermind controlling Chuck Ryker, the debt-ridden corrupt jailer who was found murdered at his home.

A bike messenger gets hit by a car and his carrier bag stolen. The bag contained evidence pertaining to an old case that Montgomery worked on.

Juror #7 Joe McUsic, who runs a halfway house, drops dead of cyanide-poisoning during Otis Williams's high-profile trial for the murder of heiress Lyla Addison. Juror #4 Tony Mueller runs as he believed Otis's cousin, Wardell, poisoned Joe and he'd be next. Wardell claims he is being framed just as the cops are trying to frame Otis. The cyanide came not from the court house vending machine coffee but was released from a capsule. The plot thickens when it was found that Joe McUsic used a bribe to be put into the jury pool. The case is complicated as there doesn't appear to be any link between Joe McUsic, Otis Williams or Lyla Addison.

The death of a bar owner takes Castle and Beckett back in time to the prohibition era.

Mysterious murder occurs during a beauty pageant and the suspects are plentiful.

A man Beckett has been secretly following is found dead - and then a notorious criminal involved in the first death is killed with Beckett's own gun. Faced with an elaborate frame-up, she has no choice but to run.

When Beckett's old training officer is killed, she takes off on a solo mission to find the killer. On the plane she runs into Castle who is flying out to the Heat Wave movie set. She lets him help her catch the killer.

Recent US citizen Amir Alhabi, an immigrant from Syria, is found dead in a building next to where his stripped cab is found. He and his cousin Jamal were the owners of the cab. Investigation of the cab's GPS shows that Amir picked up a fare earlier in the day, drove in a circle and then let him out at the same spot. The fare is identified as Fariq Yusef, a 'security attache' for the Syrian Embassy. When Castle and Beckett go to investigate a storage locker, identified from a note on Amir's phone, they find a weapons cache and are exposed to radioactive Cobalt 60. Homeland Security Agent Mark Fallon takes charge as Amir used to work in the Syrian weapons program and it is feared he created a nuclear weapon. Suspecting something didn't feel right, Castle, with Beckett's help, contacts Fariq Yusef to get more information. When Agent Fallon finds out, they are both removed from the precinct. Unofficially, they keep looking into tracing a payment to Amir and why he had a camera installed in his cab. This leads to a fake cover-up, shifting focus to cab driver Kevin McCann.

While investigating the death of an Irish mobster, Beckett and Castle uncover a local turf war that may be connected to both a late-night infomercial guru and an international drug smuggling operation. But the case turns agonizingly personal when evidence emerges that the killer they're chasing may have had a hand in Beckett's mother's murder.

When a famous psychic is murdered, Beckett and Castle search for her killer while also carrying on a spirited debate on the existence of extrasensory abilities. Evidence mounts on both sides, especially when a letter arrives from the victim, penned the day she was killed and predicting her own death -- or was it written by a clever killer, hoping to throw off the investigation?