What is the beginning summary for the book Hiroshima?

"Hiroshima" by John Hersey is a journalistic account of the atomic bombing of Hiroshima in 1945. The book follows the experiences of six survivors in the aftermath of the bombing, offering a vivid portrayal of the devastation caused by the nuclear attack and its long-lasting effects on the individuals and the city. Through their stories, Hersey explores themes of resilience, survival, and the impact of war on civilian populations.