In "Number One Fan" Castle negotiates with a troubled murder suspect who claims she's innocent.
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.
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.
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?
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.
A secret investigation conducted by Beckett related to her mother's murder goes awry when a man she has been surveilling is killed. When evidence links Beckett to the victim, she and Castle become the target of a manhunt that puts both of them in grave danger.
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.
When a murder victim who looks like Lanie is found, the team suspects they're being targeted by a serial killer.
In “Dressed to Kill,” a young woman’s murder sends Castle and Beckett into the world of cutthroat world of high-end fashion.
In "Room 147," multiple confessions to a murder make Castle and Beckett believe their case is more mysterious than meets the eye.