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With their best lead in hand, Castle and Beckett are ready to take on LokSat. But an unforeseen twist puts their case – and their lives – in jeopardy.

A psychiatric prisoner escapes and falls dead in Castle's PI office, and the examination that follows has Castle surmising the Antichrist could take a part.

After a movie star turned theater actor is mysteriously killed, Castle and Beckett go backstage and learn the star had more to worry about than just his lines.

When Hayley finds herself being implicated in a cyber-terror attack after doing an old friend a favor, Castle and Beckett rush to clear her name.

The murder of a man connected to smuggling Turkish relics sends Castle, Beckett and the 12th Precinct on a search for a stolen antique believed to be Aladdin’s lamp, in hopes that it can lead them to the killer.

When a recruit officer at the NYPD Academy is killed, Beckett and the team go back to their old training ground to investigate. Meanwhile, Castle must reckon with a decision with profound consequences for him and Beckett.

Castle returns to the City of Angels in search of answers about his missing time. But things take a deadly turn when he's recruited by the legendary Greatest Detective Society to help solve a murder.

Beckett and the 12th Precinct investigate the killing of an E.S.L. student. When the victim's class won't agree to talk to the police, Castle goes covert as a French Canadian immigrant and discovers that the victim was more than he seemed.

Castle is kidnapped and has to solve twisted puzzles and mind games with unfamiliar people; Beckett and the 12th precinct fight to rescue Castle.

The son of a Russian diplomat is killed; while investigating, Castle accommodates a cheery Russian security guard, who ends up having more to to with the case than previously presumed.

Castle finally gets his day in court when he takes the stand as the key witness to a murder from five months ago. But when new information suddenly arises, he and Beckett must race against the clock to prevent a miscarriage of justice.

A dead body is discovered in the theater of Martha's current show. Castle and Beckett's inspection opens their eyes to the shockingly dangerous world of cutthroat a capella.

When Castle and Beckett inspect the killing of a cruise ship entertainer, the get stuck on the ocean with the killer.

Castle and Beckett have to investigate New York's high-class so that they can discover the ruthless murderer of a wrenching seducer. In the meantime, Castle contrives to astonish Beckett on their anniversary.

Detective Slaughter comes back to seek Castle's aid in solving a high-stakes burglary case. But when a dead body is connected to the crime, Slaughter is placed as the head suspect, while Castle must decide whether Slaughter is guilty or help to show he's innocent.

Castle and Beckett seek help from a key witness to find a snatched painting and the killer who stole it.

Castle decides to solve the murder of an author who admired him.

When a college frat student is brutally murdered, Castle goes undercover as a professor to investigate. Castle and Beckett uncover some evil secrets the university doesn't want anyone to know about.

Beckett battles for her life a group of hired fighters. Castle is trying to figure out who his wife is fleeing from.

Castle and Beckett are adapting to Beckett's career change. A phone call from someone unknown starts a series of strange events.

Bonus "Cool Boys" episode with special audio commentary from Nathan Fillion and Adam Baldwin. Slaughter returns to enlist Castle's help in solving a high-stakes robbery case. But when a body is found linked to the crime, Slaughter becomes the number one suspect in the heist turned murder, while Castle has to determine whether he's guilty or help to prove he's innocent.