The strong start to the season continues with the exciting conclusion to "Valkyrie." The episode picks up immediately with Beckett telling Castle the bad news about being infected with the deadly toxin.
In "Get a Clue," Castle and Beckett investigatin the ritualistic murder of an accountant and learn there's more than meets the eye to her death.
The day of Castle and Beckett's wedding has arrived but will their big day actually happen? Or will they be denied their moment of happiness?
Beckett must use her wits to stay alive when she goes up against a powerful foe in "The Belly of the Beast."
When a famed relationship therapist is murdered, it appears that her access to the secrets of her elite and powerful clients led to her death.
"Need to Know" wasn't as great as some made it out be. There were some great moments, yes. But once again, the plot fell victim to poor writing.
In "Limelight," the investigation into a pop star diva's death takes a turn when the investigation reveals the victim was a decoy.
In "Room 147," multiple confessions to a murder make Castle and Beckett believe their case is more mysterious than meets the eye.
The murder of a young video store clerk takes a strange turn when the team discovers his past history as a high-level hacker.
Castle returns with a change of city and jobs for Kate Beckett. After saying "yes," Beckett moved to D.C. where her job with the AG's office isn't going as well as she hoped.