While Emma Peel is preparing to depart for the United States as the bride of a gorgeous female Russian spy - John Steed is tracking down the toughest Mafia gangster who ever graced the shore of Britain to overthrow Her Majesty's government.

You see, someone is attempting to undermine that government by means of a fiendish Oriental brainwashing technique on high-ranking civil servants, and Steed and Mrs. Peel find that all clues lead to a joint Mafia-Russian plot, which naturally, must be stopped at all costs!