Osama bin Laden's former sister-in-law provides a penetrating, unusually inti- mate look into Saudi soci-ety and the bin Laden family's role within it, as well as the treatment of Saudi women. On September 11th, 2001, Carmen bin Ladin heard the news that the Twin Towers had been struck. She instinctively knew that her ex-brother-in-law was involved in these hor-rifying acts of terrorism, and he…