The extraordinary rise of Prince Mohammed Bin Salman, ruler of Saudi Arabia - the world's biggest oil exporter. What will his reign mean for the world?Prince Mohammed, heir to the throne of the most influential country in the Middle East, is likely to rule for decades. As 'Prime Minister', the young prince has already instigated the fastest changes to Saudi society since the country's formation in 1932 - karaoke bars, mixed crowds in restaurants, and raves in the desert. Yet his rise to power has involved abductions, torture and murder. In this series, diplomats, spies, Western observers and Saudi Arabian insiders give first-hand accounts of their meetings with him and tell the story of how he has outwitted his rivals with a combination of vision, brains and brutality.