Beckett is on the hunt for the man who shot her which puts Castle in a precarious position. Soon everything will be out in the open and nothing will be the same for the 12th Precinct.
The only witness to a murder victim with human bite marks on his body insists it was a Zombie attack. Castle, Beckett and the rest of team must delve into New York's Zombie subculture to find the killer.
His relationship with Beckett strained, Castle teams up with Detective Ethan Slaughter from the city's gang unit. But Slaughter's kind of police work could put Castle in real danger.
A dead British model has Castle and Beckett working with D.I. Colin Hunt from Scotland Yard. While investigating, they become suspicious about the activities of the British Consulate's Deputy General. Lanie persuades Beckett that she needs to make a move on Castle, sooner rather than later.
Castle and Beckett must reconstruct the 47 seconds prior to the time a bomb exploded at a protest rally in order to find who planted the bomb.
When a reality dance competitor is found dead in her dressing room, Castle and Beckett find that the scandalous secret she was keeping may have led to her death.
Deceit, betrayal and secrets are all part of the case of fairytale killer. Castle and Beckett find nothing is as it seems after the bodies of two women, one dressed as Red Riding Hood and one as Snow White, are found murdered.
Time is running out as Castle and Beckett race to find "Linchpin" in order to prevent an event that could plunge the country into war. (Part 2 of 2)
An international conspiracy plays into the case of a killer being pursued by Castle and Beckett. A sexy CIA operative with ties to Castle joins in on the case. (Part 1 of 2)
In order to solve the current murder of a treasure hunter, Castle and Beckett must first solve a 1947 homicide that involved a hard-boiled private detective.
A popular reality TV star is the key to an investigation involving the death of a world-renowned dog whisperer. A famous therapist is contacted after the team discovers that one of her clients was a witness to the murder.
Castle's partnership with the police, courtesy of Castle's longtime friendship with the Mayor, is threatened when a murdered woman is found in a car from the Mayor's motor pool. The ensuing scandal could bring down Mayor Weldon's administration and with it Castle's partnership with Beckett.
The investigation of the death of a ladies' man causes problems on Ryan's wedding day.
Castle and Beckett have disappeared, leaving the rest of the detectives searching for them. Elsewhere, Castle and Beckett find themselves handcuffed together in bed in a locked room but have no idea how they got there.
The team has their toughest case ever when a sniper on a killing spree in New York City has no apparent motive. The case is especially hard on Beckett as she tries to hide her progressive PTSD moments which are surfacing.
The murder investigation of an Atlantic City casino owner leads to clues in two cities. While Beckett and Gates stay behind in New York City, Castle and the other detectives head to the East coast version of "America's Playground" to work the case and throw a spontaneous bachelor party for Ryan.moreless
A crew of bank robbers disguised as classic television doctors take hostages which include Castle and Martha. But things are complicated by the fact that Beckett's on the outside having her every move scrutinized by a hostage negotiator and Castle's on the inside with information that the hostages are just a distraction for a more ominous plan.moreless
While doing some investigative work at a New York mansion, a prominent ghost hunter is murdered. Castle and Beckett must figure out if paranormal activities are to blame.
A wealthy museum patron is a suspect when a valuable sculpture is stolen. Castle and Beckett investigate the theft with the help of an insurance investigator who sets her sights on Castle.
The shooting death of a young woman points to Ryan's stolen gun as the murder weapon - the gun stolen earlier by serial killer 3XK. Now Castle and Beckett are up against the clock to track down 3XK before he kills again.
A murder scene complete with lots of blood but no victim and high tech life-extension science are all part of the investigation as Castle and Beckett try to solve a murder without a body. Meanwhile, Alexis waits to hear news about her application to Stanford.
Castle and Beckett are after a murder suspect who's roaming the city in a Superhero costume. They think he's behind the killing of an ex-con, but it's a race to identify and catch him before he kills again.
As Beckett fights for her life, Castle attempts to find the person responsible for the shooting. Meanwhile back at the precinct, Ryan and Esposito try to adapt to the new captain in charge.