It is the onset of World War II in the fifth in the 'Strangers and Brothers' series. A group of Cambridge scientists are working on atomic fission. But there are consequences for the men who are affected by it. Hiroshima also causes mixed personal reactions.
This edition Penguin UK, 1959 in good condition. Light creasing to spine
The fifth book in the loose Strangers and Brothers series.
Orange spine, Penguin Number 1356.