It's a palace purge in Riyadh, with implications well beyond Saudi Arabia's borders. Crown Prince Mohammed bin Salman is cleaning house with the firing and sometimes jailing of royal family insiders who include billionaire businessmen and the head of the National Guard. Does it signal a shift in policy? Or is it little more than the 32-year-old heir's cementing of power ahead of an ascension to the throne that could come sooner rather than later? Produced by Charles WENTE, Alessandro XENOS, Christopher DAVIS.