This book starts on the morning the bomb is dropped on Hiroshima: August 6, 1945. The author, John Hersey, was an accomplished war reporter and took his expertise in reporting facts in a nonpartisan format seriously. Hersey follows several survivors of the bombing and matter-of-factly recounts the events that occurred.
The book was originally published as a magazine article for The New Yorker magazine. And was later published as a book with an additional chapter. Hersey won the Pulitzer. The book is a great example of narrative reporting and while not emotional in the reporting, it is harrowing in the details.
For me this book opens up the ethical debate on whether or not these bombs should be used in warfare. I adamantly say no while understanding that Truman said yes in order to end the war. I think it is a stark warning that we can and have lost our humanity during times of war.