From a Wall Street Journal review by Amanda DeMarco of the book by Oliver Guez titled “The Disappearance of Josef Mengele”:

Where does it go, the past? In 1949, it went to Argentina. In Olivier Guez’s novel “The Disappearance of Josef Mengele,” that is the year the notorious Auschwitz physician, the so-called Angel of Death, begins life anew as a fugitive in Buenos Aires. At the time, Argentina was actively importing Mengele’s kind: the country was, in Mr. Guez’s words, a “melting pot of Nazis . . . Italian Fascists . . . Vichy French . . . killers, torturers and adventurers,” a “ghostly Fourth Reich” in the Southern Cone.