Unfortunately a strict veil of secrecy over the experiments enabled Mengele to do his work more effectively. The full extent of his gruesome work will never be known because the records he sent to Dr. Von Verschuer at the Kaiser Wilhelm Institute were shipped out in two truckloads and destroyed by the latter. Any remaining notes Mengele carried with him on his escape to South America and were never found.

Some forty years after the war, only a few of the twins could be found. Strangely enough, many of them recall Mengele as a gentle, affable man who befriended them as children and gave them chocolates. Since many had immediately been separated from their families upon entering the camp, Mengele became a sort of father figure. Still a tension existed, that at any time they could be killed if they did not keep a low profile. Older twins recognized his kindness as a deception ...