Two years ago, a nattily dressed German climbed three flights of stairs to a shabby, document-cluttered flat in Vienna's Rudolfplatz, sat down to face Simon Wiesenthal. Said the visitor, an ex-Gestapo agent: "I know where you can find Franz Stanglbut it is going to cost you $25,000."
Stangl, the wartime chief of the Treblinka concentration camp, was obviously of interest to Wiesenthal, a man possessed with chasing down escaped Nazi war criminals. When Wiesenthal protested that his Jewish Documentation Center did not have anything like $25,000, the Gestapo veteran began to dicker:...