The central mystery begins when , the son of a high-ranking Russian diplomat, is found murdered with his throat slit.
Because the victim is a "diplobrat," Beckett and the team must navigate a political minefield. The Russian consulate attaches a security officer, Vasiliy Zhirov , to the case.
Beckett admits to Castle that Rita is his stepmother, finally resolving one of the secrets she had been keeping during their temporary separation. [S8E11] Dead Red
Vasiliy (played by Nick E. Tarabay) initially seems like a fun-loving tourist and a huge fan of Castle's books, but he proves to be a highly skilled operative with his own agenda.
The investigation uncovers that Grigory was looking into the death of his mother, Anya, who was believed to have died in an accident. It turns out Sergei Mishkin , the diplomat and Grigory's supposed father, killed the boy when he became an obstacle to Sergei's illegal dealings. The central mystery begins when , the son
is the 11th episode of Castle's eighth and final season, originally airing on February 15, 2016. This episode blends a high-stakes international murder mystery with significant personal developments for Rick and Kate. The Case: International Intrigue
Beyond the "murder of the week," this episode pushes the season's overarching conspiracy forward: Beckett admits to Castle that Rita is his
Castle finally meets Rita (Ann Cusack), his father's wife and a veteran spy.