Beckett and the 12th Precinct look into the murder of an English as a Second Langue student. But when the victim’s class won’t talk to the police, Castle goes undercover as a French Canadian immigrant and learns that the victim was more than he seemed.
In order to hunt down the brutal murderer of a grifting seducer, Castle & Beckett must investigate New York’s elite. Meanwhile, Castle plans to surprise Beckett on their one-year wedding anniversary.
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.
Castle thinks the Antichrist maybe involved in the death of an axe wielding psychiatric inmate who drops dead in the P.I. office.
When a priceless work of art is stolen and its transporter murdered, Castle and Beckett must work with the key witness to track down the painting and sniff out the killer.
When the body of a local college fraternity student is found gruesomely murdered, Castle has to go undercover as a professor in order to gain access to the victim's world. However, he and Beckett soon discover that behind the fun and games of college are some darker secrets the university wants to keep hidden.
When a movie star turn stage actor is mysteriously killed, Castle and Beckett go backstage and discover he had more than his lines to worry about.
When a body is found in the theater of Martha’s latest show, Castle and Beckett’s investigation leads them into the unexpectedly dangerous world of competitive a capella.
A call from a mysterious stranger ignites an explosive chain of events; the story is first told from Castle's perspective as he searches for Beckett.
A clue at the scene of the death of an armored-car driver leads Beckett and Castle back to an old case solved by Esposito. But complications arise when they learn that Esposito might not have been telling them everything about his past with the culprit.