Castle and Becket are engaged. Becket starts FBI training in Washington DC and is assigned to a case. Someone broke into a secured building and may have stolen codes. Castle flies to DC and exposed to deadly gas. The code theft was a diversion.
Rick proposes to Kate as she says yes. Now skip two months later, as she is training to be on the Attorney General Federal squad over in DC. Not the FBI as a lot of people are referring to her new job.

Rick tries to surprise Kate out. After he has finished his book tour on the West Coast. But after he stumbles upon a conspiracy that could hurt national security, he tries to help out Kate. But she warns him that he can't help her out as she is no longer NYPD. And that this is national security issue.

Also her mentor, Lisa Edlestein's federal investigator, Rachel McCord dislikes him, and warns him of obstruction. But still, as it means more hours and very less time with Castle.

Still, there is just less of the NYPD with Ryan and Eposito. As Kevin is going to be a dad. Practicing changing a diaper on a baby doll was cute.

Alexis has a new boyfriend named Pi. Whom Richard takes an instant liking to him. As he was OK, not as annoying as I am in the minority. But still, Alexis can do better than that.

Anyway it seems that Castle is inflected by some virus and given less than a day to live. As this of course, is a two parter.

Edelstein is OK as McCord. But still, a little annoying. At least she has a soul. But really telling Beckett she can't have a life, kind of makes McCord jealous that Beckett has one, and McCord does not.
Duration: 3 Discs HD DVD-9 Plastic Bag Packing Ver. ( 23 Episodes Complete Series )