NAZI BILLIONAIRES The Dark History of Germany’s Wealthiest Dynasties By David de Jong. 400 pp. Mariner, 2022. $28.99. What is left to say about the Nazis? They lost World War II some 77 years ago, their country occupied and their leaders either dead or in prison camps, waiting to be tried and judged. The Germany that emerged from the ruins has generally led the way in reckoning with its past, atoning for the Third Reich’s epic crimes through measures that include paying reparations to Jewish survivors. Three generations of historians have weighed the country’s guilt. What aspects of Germany’s dark...