The Sandy Hook Elementary shooting in Newtown, Connecticut becomes the starting point for a wider PBS investigation into American gun culture, anchored by Gwen Ifill and drawing on reporting teams from PBS NewsHour, Frontline, Washington Week, Need to Know, and NOVA. The program moves across several linked threads rather than one narrative: the political fight over gun access and legislation, the state of mental health care for young adults, and the emerging science researchers are using to try to identify violent impulses before they turn lethal. Interviews bring in gun owners, lawmakers, mental health professionals, and residents of communities that have lived through mass shootings, letting each speak to their own piece of the problem rather than forcing a single conclusion. The NOVA segment in particular treats violence prediction as an open scientific question, showing researchers testing what can and cannot be measured in advance. The film keeps returning to Newtown as the case study that forces all these separate debates, about laws, minds, and communities, into the same room.