The topics of gun control and gun laws are divisive ones for Americans, especially as firearm violence in the United States increases and death tolls rise. This nonfiction social studies title for young adults examines the history of mass shooting tragedies in the United States, from restaurants and churches to schools such as Columbine and Sandy Hook. It explores theories about mass murder motives and possible solutions for prevention, including better mental health services and assault weapon bans. Includes sidebars, a glossary, a timeline, and profiles of advocate Sue Klebold and criminology researchers Jillian Peterson and James Densley.