Incredibly thorough. This book features everything, the science, history of every single discovery and person related to nuclear physics, the politics, the Manhattan project, the dropping of the bomb, testimonies of the people it was dropped on (I compliment the author for adding this in, it makes sure to make the point that this is not just a bigger bomb), and polices after the A-bomb was dropped to the first test of the H-bomb. I have to say this book tested my capacity for retaining so much information, but I somehow succeeded and learned a great deal, but I admit I will have to reread the part about discovery and creation of plutonium... I see what the book Crystal Fire was inspired by, and the same warning I gave in that review still applies (even more so in this book).