On August 29, 1949, the first Soviet test bomb, dubbed First Lightning, exploded in the deserts of Kazakhstan. The startling event was not simply a technical experiment that confirmed the ability of the Soviet Union to build nuclear bombs during a period when the United States held a steadfast monopoly; it was also an international event that marked the beginning of an arms race that would ultimately lead to nuclear proliferation beyond the two superpowers.

Following a trail of espionage, secrecy, deception, political brinksmanship, and technical innovation, Michael D. Gord...