Castle makes a grand return to the NYPD when Beckett finds him bent over the dead body of a woman with a gun in his hand. When two more bodies show up, Beckett must decide whether to let Castle help her with the case.
A famous psychic is murdered, and of course Castle is a true believer while Beckett is the doubting Thomas. As they dig deeper into the case, Castle's theories seem to be validated, but Beckett insists there is a logical explanation for everything.
Songs: Laura Scott -- The Librarian
The murder of a bail bondsman, a mysterious document and the involvement of Beckett's ex-partner provide a puzzle that may solve a 10 year old rare gems theft.
A murdered man presents a challenging mystery, he was killed with an antique bullet. Castle's ridiculous theory of a time traveling killer is supported by various clues the team finds.
Songs: Nitzer Ebb -- Kiss Kiss Bang Bang, Alec Ounsworth -- Me You And Watson
The discovery of a second corpse inside a casket at a funeral home leaves Castle and Beckett with multiple lines of inquiry that range from hospital professionals to a drug lord.
The circumstances of the murder of a beautiful young blonde woman leads the team to believe that 3XK, the Triple Killer has struck again.
Songs: Uncle Lucius -- A Million Ways, Derek Evry -- Without You
Castle and Beckett investigate the murder of a male stripper found dressed as a NYPD police officer.
Jim Bacchi -- Friday Rock, Nelly
-- Hot In Herre, Pierluigi Ferrantini, Pierfrancesco Bazzoffi & Alessandro Sg -- Never Easy, Troy MacCubbin -- Stars Like You
While investigating the murder of a NYC subway worker found shot to death in Central Park, Castle and Beckett unexpectedly uncover the shocking and violent abduction of a young boy. Working against the clock, the team must unravel the motives behind the high-stakes kidnapping, not just to bring a murderer to justice, but to save the innocent lives that hang in the balance.
Songs: Cliff Lin -- Infiltraitor, Pajaro Sunrise -- Salt & Spoon
After a prominent astrophysicist's body is found in her car -- the victim of explosive decompression - Castle jokingly theorizes that perhaps she was killed in the vacuum of outer space. Yet as they delve deeper into the victim's life, they're confronted with a succession of evidence that keeps pointing them back to the impossible: Alien Abduction. Benny Stryker, a well-known alien abduction expert, and Lovett plays a mysterious government agent intent on shutting down the investigation.
When the body of a dockworker turned bar owner is found floating in the East River, Castle and Beckett's investigation takes them into the forgotten tunnels and passageways of turn-of-the-century New York, where they uncover a secret that's been buried since the days of Prohibition. The story celebrates New York bar culture, setting Castle on a quest to preserve history by buying a bar of his very own.
Castle's novel "Heat Wave" is being turned into a movie, and the Hollywood hottie cast as the movie's lead shows up at Beckett's invitation to better understand the character she's going to play. As our threesome investigates the murder of a high-class matchmaker, Natalie goes to extremes in the name of "character research," transforming herself into the spitting image of Beckett -- much to Castle's delight and Beckett's dismay.
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.
Old wounds are reopened when the retired lead detective on Beckett's mother's homicide case contacts her with new information, but then is gunned down right in front of Beckett before he can tell her what he knows. The investigation into his death leads back to a decades-old conspiracy that may hold the answer to who was behind Beckett's mother murder and why. With the stakes and emotions running high, Castle and Beckett take their partnership to the next level.
Songs: The Frames -- Rise
The brutal murder of a lottery winner has Castle and Beckett up to their eyeballs in suspects, envious and angered by the victim's sudden move from the poorhouse to the penthouse.
As the precinct buzzes with fantasies of what our cops would do if they won the lottery, Martha struggles with the reality of such a decision when she suddenly inherits money she feels she doesn't deserve.
Castle and Beckett find themselves on opposite sides of the case when Castle's old school friend emerges as the prime suspect in his own wife's murder. As they work to solve the crime, Castle comes to realize that one of two terrible things must be true... Either Detective Beckett is about to arrest an innocent man for murder, or his old friend is a cold-blooded killer.
Castle and Beckett investigate the apparent robbery-homicide of a New York cab driver, only to discover that the victim was involved in a mysterious conspiracy with unimaginable consequences. As the stakes continue to rise, hard-charging federal agent Mark Fallon takes over the investigation. Together, Fallon, Beckett and Castle must race to unmask the truth about the victim before it's too late.
With time running out, Castle and Beckett must put aside their differences with Agent Fallon to avert a city-wide catastrophe.
A murder has been committed on the set of "Temptation Lane," one of New York's longest running soap operas. Sarah Cutler, the head writer on the soap, has been killed with a fire axe. Castle & Beckett quickly discover that the behind the scenes drama at "Temptation Lane" is just as scandalous as the fictitious storylines, and just about everyone would kill to get ahead. Ultimately, Castle's unique skill set as a writer leads to a discovery about the killer and the secret he or she would do anything to protect.
During the high-profile trial of a murdered socialite, a juror suddenly tumbles out of the jury box -- dead! When Castle & Beckett learn the juror was poisoned, their investigation soon uncovers that this seemingly innocent juror may not have been so innocent after all.
Castle & Beckett work the case of a man found dead inside a pizza oven, but it turns out not to be someone associated with the restaurant - it was a reporter. Was his story, "The Pizza Wars," enough to get him killed, or was it something much deeper than that?
When a champion swimmer and Olympic hopeful is found dead in a training pool, Castle & Beckett dive in to investigate his murder, and uncover myriad secrets that might have led to his death.
While investigating the shooting death of her ex-partner in New York, Beckett comes to believe the suspect has fled to Los Angeles. Against orders, she travels to L.A., going renegade to track down the killer, with Castle unexpectedly along for the ride. As they dig deeper into the motives, they uncover a trail that leads from a rooftop pool in Hollywood to the sandy beach of Santa Monica. Along the way, they visit the set of the "Heat Wave" movie and enlist the cast to help break the case. But as they get closer to apprehending the killer, Castle begins to wonder whether Beckett is out for justice -- or revenge.
During rehearsal for "Baron's All-American Beauty Pageant," the contestants are shocked to discover the body of Miss Illinois - strangled, but by whom? As Castle and Beckett delve into the cut-throat competition of the pageant world, they learn that a number suspects had motive for murder, including jealous fellow contestants, the pageant's larger-than-life millionaire sponsor, Victor Baron, and the show's host -- hedonistic TV personality, Bobby Stark.
Kate Beckett's investigation into her mother's death is reactivated when Hal Lockwood - a professional hitman with knowledge of Beckett's mother's murder - stages a spectacular escape during a court hearing. As police launch a manhunt for Lockwood, Castle and the team uncover evidence of a deeper conspiracy involving a mysterious figure with law enforcement connections who is linked to both Lockwood's escape and the killing of Johanna Beckett. The search for Lockwood and the quest to identify his co-conspirator leads to a shocking and deadly conclusion.