Fernando Henrique Cardoso received a phone call in the middle of the night asking him to be the new Finance Minister of Brazil. As he put the phone down and stared into the darkness of his hotel room, he feared he'd been handed a political death sentence. The year was 1993, and he would be responsible for an economy that had had seven different currencies in the previous eight years to cope with inflation that had run at 3000 percent a year. Brazil had a habit of chewing up finance ministers with the ferocity of an Amazon piranha.

This was just one of the turns in a largely unscripted and...