A psychiatric inmate escapes and drops dead in Castle's PI office, and the investigation that follows has Castle surmising the Antichrist could be involved.
A city inspector cheats death twice when he survives separate poisoning attempts, and a curious Castle and Beckett grow determined to solve this mysterious case.
The team head to the NYPD Academy for an investigation involving a murdered recruit. Meanwhile, Castle grapples with a decision with far-reaching ramifications for himself and Beckett.
A student learning to speak English is killed and his classmates keep mum when questioned by police, so Castle goes undercover to gain info on the victim by enrolling in the class as a French Canadian immigrant.moreless
A Russian diplomat's son is killed, leading Castle and Beckett to learn about international crime and foreign politics as Castle is tasked with keeping a Russian security officer busy.
A body is found in a theater where Martha is working, so Castle and Beckett investigate and are surprised to learn how cutthroat Acappella singers can be.
Det. Slaughter returns seeking Castle's help in a robbery case. However, Slaughter becomes a suspect when the heist case turns into a murder case, and Castle's unsure about whether his pal is innocent or guilty.moreless
An art thief steals a rare painting and kills the person transporting it, so Castle and Beckett team up with the key witness in order to find the culprit.
A hermit-like author idolized by Castle is killed, and Castle resolves to solve the murder.
Castle goes undercover as a professor after a college fraternity student is killed in a grisly manner. During the investigation, he and Beckett unearth some sinister secrets the university wants to keep suppressed.moreless
Since passing her Captain's exam and the offer to run for State Senate, Beckett and Castle are adjusting to her career change. A call from a mysterious stranger sets off an unpredictable chain of events.moreless
In the seventh-season finale, a death occurs in the woods and Castle becomes obsessed with the case because it reminds him of a pivotal event in his childhood. Meanwhile, Beckett reaches a turning point in her life.moreless
On route to London, Castle and Alexis' routine flight turns deadly when the plane's Air Marshal is found murdered. With Beckett's help on the ground, they race to find the killer before he carries out his deadly plan.moreless
Beckett and Castle investigate the murder of personal-injury attorney Richie "The Pitbull" Falco by looking into his clients and competitors, but it's a shocking secret they uncover that may be the link to his murder.moreless
While Castle and Beckett team up with a hot-shot detective from Hong Kong to investigate a man murdered in the park, Beckett realizes that neither her Hong Kong colleague nor the victim may be quite who they seem.moreless
Part 2 of 2. Stakes rise as the 12th Precinct matches wits with serial killers Jerry Tyson (3XK) and Dr. Kelly Nieman. Castle and the team must crack the case before the killers claim their next victim.moreless
Hired to look into possible infidelity, Castle unexpectedly witnesses the murder of his client by her husband, but there's no proof the killing took place. Castle and Beckett look for the answers to expose the truth.moreless
When Castle is prohibited from working with Beckett or the 12th Precinct he gets his P.I. license and shows up at Beckett's crime scene as a private investigator, where things don't go as planned.moreless
Castle and Beckett's investigation into the shooting death of an ER physician leads them to a Mafia family run by an old friend of Castle's. Esposito and Lanie reach a defining moment in their relationship.moreless
Castle and Beckett pose as newlyweds at an Old West-style resort to discover the truth about a murder victim.
Castle and Beckett are motivated to be wed after a murder investigation dispatches Castle into an alternate universe where he's never met Kate, Ryan or Javier.
Castle and Beckett discover that the killer of a pool shark may have psychic powers as they hunt for the "invisible man". Castle and Beckett make an effort to get their lives back to normal.moreless
The season 7 premiere picks up right where last season's finale left off. As Castle was driving to his wedding a black SUV came roaring at him. Beckett is worried when Castle doesn't show up but soon she is called to an accident scene where Castle's car is engulfed in flames. Now Beckett must find who or what caused the crash and determine if Castle could have survived.moreless
Beckett conducts a covert investigation related to her mother's murder but things go terribly wrong when the subject under surveillance is killed. Castle and Beckett become the object of a manhunt when evidence connects Beckett to the victim.moreless
The body of a missing New York mobster who disappeared in the seventies is found at a construction site, but the only witness thinks it's still the 1970's. Castle and Beckett must play along with his delusion to find out what he knows.moreless
After a Japanese ballet dancer is inexplicably murdered, Castle and Beckett find that her secret life provides evidence of a ninja assassin, and now that ninja is after them.
Castle and Beckett seemingly have an open and shut murder case when a woman confesses to having murdered a struggling actor. But when they determine the woman couldn't have done it, another comes forward to confess just as convinced they did the murder. The team realizes that multiple confessions by strangers have made this a mysterious case indeed.moreless
Castle and Beckett make their way through the glitzy world of high fashion to find who killed a magazine editor's assistant. Access to a very special wedding surprise is provided to Beckett.
Castle and Becket search for a serial arsonist turned murderer after they find that the dead body in a building fire was in fact shot to death. Jenny goes into labor but Ryan's put in some danger that could ruin the moment.moreless
Beckett and Castle are tasked with solving the murder of man who handed a baby over to a priest just before he died. While playing nanny to the lost child, they must figure out who killed the man, how did he come to have the baby, who isn't related to him, and where are the rightful parents.moreless