Includes forewords from Kristina Anderson and Jack Levin Includes the newest research relating to mass shootings including on: restorative discipline, bystander behavior and threat assessment, patterns of school shootings, the role of gender in averted incidents, and the role of the media in lessening the copycat effect Examines averted school rampages across the Northeastern United States, and the recent non-averted shootings in Florida and Texas, and discusses policy developments Draws on in-depth data and interviews with school and police officials (administrators, counselors, security and police officers, and teachers) who were directly involved in preventing these shootings Explores how these kinds of attacks can be effectively prevented, and what factors and policies make these events more likely to occur Offers insight into what policies and practices are actually dangerously counter-productive