It is America's worst nightmare: A nuclear bomb destroys a major city, killing thousands. Many more will die. Threats of more attacks spread panic. National security advisor Sean Falcone is tasked with identifying and tracking down the attackers. Powerful forces in the Capitol point the finger at Iran, but Falcone discovers an astonishing secret hidden among the upper echelons of Washington's elite. Will the President - or the American people - believe him?