The brutal murder of an undercover agent reveals a plot to foment a full-fledged war between Russia and Ukraine. Former U.S. Ambassador to the Ukraine Douglas Flannery meets with an old friend and former spy to help thwart a Russian plan to overrun her native Ukraine; but the group she's working for is planning a much more dangerous scheme in order to draw in NATO forces--and possibly ignite World War III. After the spy is killed following their meeting, Director Chase Williams and his team in the Op-Center must use cyber warfare and spycraft in tandem with Douglas's information to prevent the United States from being forced to take sides in a crisis as Ukraine, its NATO allies, and Russia rapidly deploy forces in a dangerous game of brinksmanship.