Castle

Season 6 Episode 1:

Valkyrie

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.
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About Castle:

After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle gets permission from the Mayor of New York City to tag along with an NYPD homicide investigation team for research purposes.