The Devil Reached Toward the Sky is the book that finally made the Manhattan Project accessible to me— a realtime sequence of decisions made by smart yet fallible people under desperate circumstances. My interest in this topic began a few years back while visiting my son at the University of Chicago. As part of the campus tour, I saw the sites where the first controlled nuclear reaction took place. Since then, I have tried reading earlier accounts of the project, including the one by Rhodes, but none quite held my attention until this play by play narrative arrived at my doorstep. What sets this book apart is its reliance on actual quoted statements and bona fide records, allowing the story to unfold as if one were transported back in time and witnessing events firsthand.
From Theory to War
Ernest Rutherford, writing in 1904: “If it were ever found possible to control at will the rate of disintegration of the radio-elements, an enormous amount of energy could be obtained from a small quantity of matter”.
The book provides an excellent grounding of the science before plunging into details. Atomic fission is the splitting of an atom’s nucleus. Uranium-235 is the rare isotope that readily splits and releases energy, while Uranium-238 is far more common and does not. Plutonium-239 is created when Uranium -238 absorbs neutrons in a reactor, and it too can be made to split. Japan’s attack on Pearl Harbor became the inflection point that drew the United States into the war and accelerated the pursuit of bomb development. Parallel efforts to build the bomb through uranium separation and plutonium production had to be pursued, a reminder of how uncertain the outcome once was.
Secrecy, and Scale
Enrico Fermi: “ The reaction is self-sustaining”.
One of the most compelling sections of the book covers the Chicago Pile and how it was planned, assembled, and tested beneath the stands of Stagg Field. The use of innocuous names : Met Lab, Manhattan Project etc, highlights how secrecy operated in plain sight. The story progresses from elite universities to Oak Ridge, Tennessee and Los Alamos, New Mexico, and industrially to nylon manufacturers adapting their
skillsets and building nuclear reactors. Companies like DuPont, Union Carbide, Eastman Kodak, Westinghouse, and others were pulled into an effort whose true purpose most workers never knew.
A remarkable cast of Characters
Excerpt from Truman’s speech, a response to the deployment of the bomb: ” But the greatest marvel is not the size of the enterprise, its secrecy, nor its cost, but the achievement of scientific brains in putting together infinitely complex pieces of knowledge held by many men in different fields of science into a workable plan. And hardly less marvelous has been the capacity of industry to design, and of labor to operate, the machines and methods to do things never done before, so that the brain child of many minds came forth in physical shape and performed as it was supposed to do. What has been done is the greatest achievement of organized science in history. It was done under high pressure and without failure”.
Oppenheimer emerged as a visionary leader, eventually appointed director of Project Y at Los Alamos. His earlier work with Max Born struck a personal note for me — Born was also my grandfather’s doctoral advisor in the 1930s. Vannevar Bush played a central coordinating role in the Manhattan Project, helping organize scientific research, secure government backing, and drive the effort forward at a critical moment. General Leslie Groves, with his strict sense of rank and authority, forms an unlikely but extraordinarily productive partnership with Oppenheimer, perhaps one of the most effective collaborations in U.S. government history. Their clashes over secrecy versus openness with Groves favoring compartmentalization, and Oppenheimer insisting that science requires shared knowledge, set a precedent still relevant today.
Los Alamos
J. Robert Oppenheimer reflecting on the monumental impact of the atomic bomb: “If atomic bombs are to be added as new weapons to the arsenals of a warring world, or to the arsenals of nations preparing for war, then the time will come when mankind will curse the name of Los Alamos.”
Los Alamos was a place that stood out for its innovation but marked by uncertainty. Scientists did not know how fast neutrons exited an atom, how plutonium would behave, or whether the bomb would even work. The plutonium problem in particular forced a radical shift to implosion design, bringing figures like Johnny von Neumann into the picture with brilliant concepts such as explosive lenses. Xenon poisoning nearly derailed the reactors until engineers learned to overwhelm it by producing excess neutrons. The sheer number of unknowns and how much was solved in such a short time is mind boggling.
This book does not shy away from describing the human and environmental cost. Farms and homes were seized, Indigenous communities were displaced, and entire regions were permanently altered. DuPont became so reviled in some areas that people refused to buy its products for years. The lands appropriated during World War II remain dangerously contaminated, with cleanup costs estimated in the hundreds of billions, and much of it will never be returned to public use.
From Test to Deployment
Robert Oppenheimer, Quoting from the Gita: “ Now I have become death, the destroyer of the worlds”.
The final sections move briskly toward inevitability. The Trinity test is described through the reactions of those who witnessed it: “God has spoken,” one observer said, while Oppenheimer recalled a line from the Bhagavad Gita. The political backdrop was also shifting rapidly: Roosevelt dies, Truman assumes the presidency, and Germany falls, all attention now turning fully to Japan. Firebombing has already devastated cities, and the belief that Japan would not surrender without overwhelming force drives the decision to proceed with deploying the atom bomb.
The logistics of deployment are detailed with precision: the B-29s, the accompanying weather planes, the photo and instrument aircraft, and the final assembly happening on Tinian. The USS Indianapolis delivers key bomb components and is sunk shortly afterward. On August 6, 1945, Enola Gay, named after the pilot’s mother, drops Little Boy. The pilot’s skillful, sharp exit turn to minimize the impact of the shockwave, and the release of energy equivalent to 20,000 tons of TNT, marks the moment when theory became a catastrophic reality. The utter devastation, and the terrible human loss and suffering unleashed, are conveyed through quoted, harrowing accounts from survivors. Three days later, the plutonium bomb Fat Man is dropped on Nagasaki. Japan surrenders, and the most horrific war in history is finally over.
This is historical nonfiction at its best—meticulous, very readable, and grounded in verifiable detail. The Devil Reached Toward the Sky succeeds not just in explaining how the bomb was built, but in showing how science, management, politics, and morality collide in real time. It left me with a clearer understanding of this monumental achievement, and a deep concern and sadness for its consequence on humanity. Few books manage to do both so effectively.