No American statesman has been as revered or as reviled as Henry Kissinger. Once hailed as “Super K”—the “indispensable man” whose advice has been sought by every president from Kennedy to Obama—he has also been hounded by conspiracy theorists, scouring his every “telcon” for evidence of Machiavellian malfeasance. Yet as Niall Ferguson shows in this magisterial two-volume biography, drawing not only on Kissinger’s hitherto closed private papers but also on documents from more than a hundred archives around the world, the idea of Kissinger as the ruthless arch-realist is based on a profound misunderstanding.