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Goodreads asked Gerald Posner:

Where did you get the idea for your most recent book?

Gerald Posner In 1984, I traveled to Buenos Aires as part of my research for a biography of
Nazi Dr. Josef Mengele. In a great break, I got access to the Federal Police file on Mengele. There, and later in files in Paraguay, I came across information about Nazis who had arrived in South America with the help of some prominent Catholic bishops after the war. I promised to return one day to that story to see what else I might discover. It took twenty years before I found a publisher willing to let me conduct a no-holds barred investigation. And what I discovered is that my initial focus - on the church on possible links to Nazi fugitives - was much too narrow. The story I uncovered centered on money and power. What I thought would concentrate on a decade expanded into a 200-year history.
Gerald Posner
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