Stefan Zweig in Ossining, New York, in 1941, seven years after he fled the ascendant Nazism of Europe. PHOTOGRAPH BY ULLSTEIN BILD / GETTY

The Austrian émigré writer Stefan Zweig composed the first draft of his memoir, “The World of Yesterday,” in a feverish rapture during the summer of 1941, as headlines gave every indication that civilization was being swallowed in darkness. Zweig’s beloved France had fallen to the Nazis the previous year. The Blitz had reached a peak in May, with almost fifteen hundred Londoners dying in a single night. Operation Barbarossa, the colossal invasion of the Soviet Union by the Axis powers, in which nearly a million people would die, had launched in June. Hitler’s Einsatzgruppen, mobile killing squads, roared along just behind the Army, massacring Jews and other vilified groups—often with the help of local police and ordinary citizens.

Zweig himself had fled Austria preëmptively, in 1934. During the country’s brief, bloody civil war that February, when Engelbert Dollfuss, the country’s Clerico-Fascist Chancellor, had destroyed the Socialist opposition, Zweig’s Salzburg home had been searched for secret arms to supply the left-wing militias. Zweig at the time was regarded as one of Europe’s most prominent humanist-pacifists, and the absurd crudity of the police action so outraged him that he began packing his things that night. From Austria, Zweig and his second wife, Lotte, went to England, then to the New World, where New York City became his base, despite his aversion to its crowds and abrasive competitiveness. In June of 1941, longing for some respite from the needs of the exiles in Manhattan beseeching him for help with money, work, and connections, the couple rented a modest, rather grim bungalow in Ossining, New York, a mile uphill from Sing Sing Correctional Facility. There, Zweig set to furious work on his autobiography—laboring like “seven devils without a single walk,” as he put it. Some four hundred pages poured out of him in a matter of weeks. His productivity reflected his sense of urgency: the book was conceived as a kind of message to the future. It is a law of history, he wrote, “that contemporaries are denied a recognition of the early beginnings of the great movements which determine their times.” For the benefit of subsequent generations, who would be tasked with rebuilding society from the ruins, he was determined to trace how the Nazis’ reign of terror had become possible, and how he and so many others had been blind to its beginnings.

Zweig noted that he could not remember when he first heard Hitler’s name. It was an era of confusion, filled with ugly agitators. During the early years of Hitler’s rise, Zweig was at the height of his career, and a renowned champion of causes that sought to promote solidarity among European nations. He called for the founding of an international university with branches in all the major European capitals, with a rotating exchange program intended to expose young people to other communities, ethnicities, and religions. He was only too aware that the nationalistic passions expressed in the First World War had been compounded by new racist ideologies in the intervening years. The economic hardship and sense of humiliation that the German citizenry experienced as a consequence of the Versailles Treaty had created a pervasive resentment that could be enlisted to fuel any number of radical, bloodthirsty projects.

Zweig did take notice of the discipline and financial resources on display at the rallies of the National Socialists—their eerily synchronized drilling and spanking-new uniforms, and the remarkable fleets of automobiles, motorcycles, and trucks they paraded. Zweig often travelled across the German border to the little resort town of Berchtesgaden, where he saw “small but ever-growing squads of young fellows in riding boots and brown shirts, each with a loud-colored swastika on his sleeve.” These young men were clearly trained for attack, Zweig recalled. But after the crushing of Hitler’s attempted putsch, in 1923, Zweig seems hardly to have given the National Socialists another thought until the elections of 1930, when support for the Party exploded—from under a million votes two years earlier to more than six million. At that point, still oblivious to what this popular affirmation might portend, Zweig applauded the enthusiastic passion expressed in the elections. He blamed the stuffiness of the country’s old-fashioned democrats for the Nazi victory, calling the results at the time “a perhaps unwise but fundamentally sound and approvable revolt of youth against the slowness and irresolution of ‘high politics.’ ”

In his memoir, Zweig did not excuse himself or his intellectual peers for failing early on to reckon with Hitler’s significance. “The few among writers who had taken the trouble to read Hitler’s book, ridiculed the bombast of his stilted prose instead of occupying themselves with his program,” he wrote. They took him neither seriously nor literally. Even into the nineteen-thirties, “the big democratic newspapers, instead of warning their readers, reassured them day by day, that the movement . . . would inevitably collapse in no time.” Prideful of their own higher learning and cultivation, the intellectual classes could not absorb the idea that, thanks to “invisible wire-pullers”—the self-interested groups and individuals who believed they could manipulate the charismatic maverick for their own gain—this uneducated “beer-hall agitator” had already amassed vast support. After all, Germany was a state where the law rested on a firm foundation, where a majority in parliament was opposed to Hitler, and where every citizen believed that “his liberty and equal rights were secured by the solemnly affirmed constitution.”

Zweig recognized that propaganda had played a crucial role in eroding the conscience of the world. He described how, as the tide of propaganda rose during the First World War, saturating newspapers, magazines, and radio, the sensibilities of readers became deadened. Eventually, even well-meaning journalists and intellectuals became guilty of what he called “the ‘doping’ of excitement”—an artificial incitement of emotion that culminated, inevitably, in mass hatred and fear. Describing the healthy uproar that ensued after one artist’s eloquent outcry against the war in the autumn of 1914, Zweig observed that, at that point, “the word still had power. It had not yet been done to death by the organization of lies, by ‘propaganda.’ ” But Hitler “elevated lying to a matter of course,” Zweig wrote, just as he turned “anti-humanitarianism to law.” By 1939, he observed, “Not a single pronouncement by any writer had the slightest effect . . . no book, pamphlet, essay, or poem” could inspire the masses to resist Hitler’s push to war.

Propaganda both whipped up Hitler’s base and provided cover for his regime’s most brutal aggressions. It also allowed truth seeking to blur into wishful thinking, as Europeans’ yearning for a benign resolution to the global crisis trumped all rational skepticism. “Hitler merely had to utter the word ‘peace’ in a speech to arouse the newspapers to enthusiasm, to make them forget all his past deeds, and desist from asking why, after all, Germany was arming so madly,” Zweig wrote. Even as one heard rumors about the construction of special internment camps, and of secret chambers where innocent people were eliminated without trial, Zweig recounted, people refused to believe that the new reality could persist. “This could only be an eruption of an initial, senseless rage, one told oneself. That sort of thing could not last in the twentieth century.” In one of the most affecting scenes in his autobiography, Zweig describes seeing the first refugees from Germany climbing over the Salzburg mountains and fording the streams into Austria shortly after Hitler’s appointment to the Chancellorship. “Starved, shabby, agitated . . . they were the leaders in the panicked flight from inhumanity which was to spread over the whole earth. But even then I did not suspect when I looked at those fugitives that I ought to perceive in those pale faces, as in a mirror, my own life, and that we all, we all, we all would become victims of the lust for power of this one man.”