Just 15 days before the 9/11 attacks, a well-connected Saudi family suddenly abandoned their luxury home in Sarasota, Fla., leaving behind jewelry, clothes, opulent furniture, a driveway full of cars — including a brand new Chrysler PT Cruiser — and even a refrigerator full of food. About the only thing not left behind was a forwarding address. The occupants simply vanished without notifying their neighbors, realtor or even mail carrier. The 3,300-square-foot home on Escondito Circle belonged to Esam Ghazzawi, a Saudi adviser to the nephew of then-King Fahd. But at the time, it was occupied by his daughter and...