A Saudi Arabian accused of associating with several of the September 11 hijackers and who disappeared from his home in the United States a few weeks before the attacks on the World Trade Centre and the Pentagon, is in London working for his country’s state oil company. Abdulaziz al-Hijji and his wife Anoud left three cars at their luxurious home in a gated community in Sarasota, Florida — one of them new — and flew to Saudi Arabia in August 2001. The refrigerator was full of food; furniture and clothing were left behind; and the swimming pool water was still...