At the close of World War II, infamous Nazi war criminal Josef Mengele fled in secret to South America, successfully evading justice for the rest of his life. Modern experts still wonder what exactly he was up to during his time there, from 1949 to 1979. Some are convinced he continued experimenting on human beings, seeking a way to create twins -- and one settlement he visited, Cândido Godói, has an abnormally high frequency of twin births to this day. Could Mengele have been involved?