Al Qaida was unable to realize its lethal potential until it found sanctuary in Afghanistan, where Osama bin Laden fled after being expelled from Sudan. But why was the network's sanctuary not attacked before September 2001, especially after the bombing of the U.S. embassies in Kenya and Tanzania in 1998? Abou Zahab and Roy argue that the Taliban was part of a much wider radical Islamist network in the region, whose true center was Pakistan, not Afghanistan. Al Qaida, the Taliban, the Pakistani Deobandis--all of these groups are based in Pakistan, which continues to serve as the regional hub...