Investigate Europe can reveal how the daughter of Congo-Brazzaville's president secretly obtained 15 per cent in a subsidiary of Oslo-listed Petronor, a minority partner in a lucrative drilling licence. Thanks to a backstage deal, Julienne Sassou-Nguesso was entitled to millions in dividends from the oil field operated by energy giant Perenco. Others involved in the scheme include the president's son-in-law and the leader of a political party.