On 27 October 2018 Bari Weiss's childhood synagogue in Pittsburgh became the site of the deadliest attack on Jews in American history. For most of us, the massacre came as a total shock. But to those who have been paying attention, it was only a more violent, extreme expression of the broader trend that has been sweeping Europe and the United States for the past two decades. No longer the exclusive province of the far right and far left, anti-Semitism finds a home in identity politics, in the renewal of 'America first' isolationism and in the rise of one-world socialism. An ancient hatred increasingly allowed into modern political discussion, anti-Semitism has been migrating toward the mainstream in dangerous ways, amplified by social media and a culture of conspiracy that threatens us all. In this urgent book, New York Times writer Bari Weiss makes a powerful case for renewing Jewish and liberal values to guide us through this uncertain moment.