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 "Room 147," multiple confessions to a murder make Castle and Beckett believe their case is more mysterious than meets the eye.
A bleeding man stumbles into a church, but just before dying, he hands a mysterious bundle to the priest. When the bundle turns out to be a smiling baby boy, Castle and Beckett find themselves accidental nannies to the newborn.
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.
A suspect (Joshua Gomez) in a grisly murder claims he has traveled back in time to prevent terrible events from unfolding.
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?
Castle and Beckett enter the world of extreme sports when they investigate the murder of a rising skateboarding star.
How do you jog the memory of a former mobster to find who killed his boss? You make like it's 1978 and boogie. Castle and Beckett done polyester and laced up the platform shoes to solve a murder mystery.
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.
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.