United States foreign policy is undergoing a dramatic transformation. Institutions of diplomacy and development are reeling from deep budget cuts. The diplomats who make America's deals and protect its citizens around the world are walking out in droves. Offices across the State Department sit empty, while abroad the military-industrial complex has assumed the work once undertaken by peacemakers. In a journey from the corridors of power in Washington, DC, to some of the most remote and dangerous places on earth--Afghanistan, Somalia, and North Korea among them--investigative journalist Ronan Farrow illuminates one of the most consequential and poorly understood changes in American history. His firsthand experience as a State Department official affords a personal look at some of the last standard bearers of traditional statecraft, including Richard Holbrooke, who made peace in Bosnia and died while trying to do so in Afghanistan. Drawing on newly unearthed documents, and richly informed by rare interviews with warlords, whistle-blowers, and policymakers--including every living secretary of state from Henry Kissinger to Hillary Clinton to Rex Tillerson--Farrow makes the case for an endangered profession.