This narrative history details a process that was taking shape in the winter of 1933 as domestic passions around the world colluded to drive governments towards a war few of them wanted and none of them could control. All Against All is the story of the season our world changed from postwar to prewar again. It is a book about the power of bad ideas—exploring why, during a single winter, between November 1932 and April 1933, so much went so wrong. Historian Paul Jankowski reveals that it was collective mentalities and popular beliefs that drove this crucial period that sent nations on the path to war, as much as any rational calculus called “national interest.” Over these six months, collective delusions filled the air. All Against All reconstructs a series of seemingly disparate happenings whose connections can only be appraised in retrospect. As he weaves together the stories of the influences that conspired to lead the world to war, Jankowski offers a cautionary tale relevant for western democracies today.