This book presents the story of the first explosion of an atomic device, including the events leading up to the explosion, the people involved, and the legacy that it created. Focusing on the Trinity test, the book provides a detailed localized perspective. It begins by describing the origins of Los Alamos, the construction and naming of the Trinity test site, and the actions leading up to the blast. It continues on to discuss the aftermath, including the effects of the fallout and how it harmed the environment, people, and animals. Finally, the author examines the local and international legacies of the critical day in history.