Obviously this is not Sikhi related but the 3 part doc provides a fascinating insight in to the affair of this secretive regime and the gargantuan levels of corruption involved between the Royal Family and the West. I still need to see part 3, part 2 was an excellent watch!
https://www.bbc.co.uk/iplayer/episode/b09m53py/house-of-saud-a-family-at-war-series-1-episode-1