An entertainer on a cruise ship is killed, and Castle and Beckett investigate while trapped on the ship with the murderer.
A seductive con man is killed, and the investigation has Castle and Beckett questioning New York City's upper crust. Meanwhile, Castle has a surprise in store for his and Beckett's one-year anniversary as husband and wife.moreless
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
In the conclusion of the eighth-season opener, Beckett's disappearance is examined from her angle as she fights to stay alive and uncover who wants to see her demise.
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
Ryan puts the pressure on Theo by holding a press conference, and the killer retaliates by going after someone close to Ryan looking for bait for a trap. Meanwhile, Gwen and Ryan starts to reconcile, and Mike hangs onto life by a thread.moreless
Max sets out to find the missing Ryan, but Eliza's mole in the FBI has other ideas. Meanwhile, Theo plans to exact vengeance on Ryan for Penny's death, but things don't go according to his plan.moreless
While Ryan and Max continue the search for Theo and the missing Erin, Mark and Daisy make a deal with Theo to get Mike.
Theo tries to trade Mike for Penny, and Ryan is forced to turn to Max for assistance. Meanwhile, Daisy and Mark have a parting of the ways, and Lisa is called in to assist in the investigation.moreless
While the FBI seeks out a new serial killer with ties to Theo, Theo and Penny look for the person who can restore their anonymity. Meanwhile, Ryan continues to descend into insanity as visions of Joe haunt him.moreless
Joe manages to take three hostages and demands that Ryan visit him before his hostage. Meanwhile, Theo recruits an ally and attempts to solve Strauss' encryption.
Theo convinces a man that he is the chosen one so that he can get in contact with Joe. Meanwhile, Mark tracks Daisy down, while Mike and Max try to track down the missing laptop from Mark's safe house.moreless
While Ryan and his team close in on Theo, the killer finds his family life at risk due to a nosy neighbor. Meanwhile, Gina considers retirement and Gwen realizes that Ryan is losing it.moreless
As Joe's execution nears, Ryan and Mike face a new threat, while Max is cleared to rejoin the task force and immediately finds herself in harm's way.
While Mike and Ryan track Strauss to a small town and a dark secret, Max considers confessing to Gwen... unaware that Tom is still secretly monitoring her.
Mark, Kyle, and Daisy pick four new targets and then go after a fifth. However, Ryan and the others realize who their true target is.
The case against Strauss begins to unravel in court, and Ryan has to locate a key witness--and old flame--before it's too late. Meanwhile, Mark tracks down the woman pulling Kyle and Daisy's strings.moreless
Ryan, Mike, and Max hunt down Neil, while Mark abducts two reporters so that they can tell his side of the story.
Ryan tries to determine the connection between Joe and Mark. However, he soon finds himself in a dangerous situatoin and is forced to face the truth... or die Meanwhile, tensions within the group continue growing.moreless
Ryan tries to move on with his life now that Joe is awaiting execution for his crimes. However, a new series of grisly murders drags him back in and Ryan realizes that Joe's murder spree was only the beginning.moreless
The team vows to help Charlie when she leaves the CIA to track down Omar Fatah.
Charlie and President Payton must decide what they are willing to sacrifice in order to apprehend Sheikh Hakam, the world's most wanted terrorist. The President also has to find a way to the keep the secret mission secret while she attends the Correspondent’s Dinner at the White House.moreless
When a terrorist escapes custody, Charlie and Lucas help the FBI with the search.
Charlie and her team work to prove that a sorority girl is actually an active member of Ar Rissalah's U.S. terrorist cell. Charlie also has to deal both with the possibility of having been betrayed by one of her closest allies and, despite her best efforts, not being able to prevent an attack on the homeland.moreless
After The Revolutionary Forces of Colombia (FARC) kidnap a man from a Panamanian prison, Charlie returns to Langley to coordinate the rescue operation. Meanwhile, Maureen struggles to fill in for Charlie as the President's briefer and the bomb squad is called when a suspicious backpack is found in front of the Washington Monument.moreless
Numerous photos of national landmarks featuring an Arabic symbol surface. Meanwhile, Charlie is in Yemen to make contact with her asset; Nick's masked captor leads him to his next mission; Lucas oversees an interrogation at Langley; and President Payton must make a difficult decision.moreless
President Payton, with Charlie and Maureen, flies to Qatar for a meeting with the prime minister regarding the future of American military bases in the country.