To be completely honest, the beginning is a bit tough. IIRC it focuses mostly on Niels Bohr, his life, and his philosophical approach to quantum physics.

Once the book centers itself around Leo Szilard, things start to pick up. Having said this, I agree with the previous comment. The book is amazing. Disclaimer: I listened to it in audiobook format through Audible

I discovered this book several years ago thanks to someone here on HN. I did the audiobook version and found it gripping.

Bought the paperback version so I could refer back to favorite parts.

Rhodes' personal story is really interesting. CSPAN did a great interview with him many years ago - highly recommended.

https://www.c-span.org/video/?155692-1/depth-richard-rhodes