Unlike most of the biographies of the 20th Century Quantum Physicists this book, this book is not about the discoveries of Oppenheimer but what was the character of Robert Oppenheimer and in particular whether he was Communist or not.

As a pre war intellectual he participated in many causes that were organised by the Communist party but it seems that he was either on fringe or carefully hid is membership. It is interesting to remember how many people were active in pro-Communist causes, such as support for the Spanish Civil War.

It seems the Military were aware of this, but felt it was better to have him at Los Alamos than to be outside the project possessing such dangerous knowledge.

During and after the war he led his life under constant surveillance. His letters were read, his phone tapped, he was followed. His associates and family monitored.

At length, the book records the atmosphere of the 1930s~1950s where guilt by association was assumed, jobs and academic positions were only available to the untainted.

One of the most interesting developments of this era was of the realization of the consequences of the development of nuclear weapons. The Los Alamos scientists were the first to understand that it was a matter of time before other countries developed them and that a determined enemy could deliver one to American soil by boat, by land or by air. Almost to a man, the scientists were for international monitoring of nuclear proliferation and that the only way to be safe was total nuclear disarmament.

If you want a full picture of Oppenheimer this is probably going to be the reference text. If you are just interested in the Manhattan Project then there is probably too much uninteresting detail and the coverage of the project is over very quickly in comparison with the rest of the book.

As an audiobook, at 26 hrs and 34 mins, this book was a long slog.