What I find amazing and dumbfounding is that while there are 27,398 readers here who have read John Hersey's book about the dropping of the first atomic bomb on Hiroshima, there are only 6 who have read this account of the dropping of the second atomic bomb on Nagasaki. In my view Chinnock's book is a far more interesting and compelling read than Hersey's.
This book is filled with ironies. Nagasaki was not even on the list of the original four possible targets for bombing. On the morning of August 9th, 1945 Kokura was the primary target. When it was found to be obscured by smoke, the plane headed to Nagasaki. That target was found to be obscured by clouds but the crew disobeyed orders and dropped their bomb by radar rather than by sight. You read about a young Japanese boy playing with friends. He dives to the bottom of a river to retrieve his sister's bell. When he surfaces his playmates are dead or dying and the surrounding area is utterly destroyed. Similarly, a young boy is playing hide and seek with his friends. He is "It" and standing in the open while his friends are all low to the ground and hiding under or behind things. They are all a few hundred yards from "ground zero". In a flash the "It" boy turns to ash. All his friends survive the blast, many to die of radiation sickness soon after. Seeing a lone B-29 flying high overhead a group of nuns rush across a field to seek shelter. 15 go in one direction. One goes in another and trips and rolls down a slope. She alone survives.
Even the title of this book is ironic since this book is no longer in print but an electronic copy can be read on openlibrary. org. I encourage you to do so.