Readers learn about the #NeverAgain movement, from the history of the right to bear arms to later efforts at gun control, legislation such as the Brady handgun Violence Protection Act and the implementation of background checks, to the school shootings at Columbine, Sandy Hook and Parkland and the creation of #neveragain.

#NeverAgain -- An explosive history -- Building a movement -- March for our lives -- Changing gun laws -- Guns and politics -- Hope for the future -- Timeline -- Glossary -- Online resources -- Index.