Dr Ngozi Okonjo-Iweala reveals her worst days in office as Finance Minister. She noticed large sum of money was being spent on fuel subsidy to oil importers. She investigated and discovered a $2.4 billion fraud. So she refused to pay the importers. This led to threats to her and her mother got kidnapped. For her mother to be released, the kidnappers asked her to resign and leave the country. But the mother later escaped and kidnappers were caught.