FRONTLINE reports from the lawless Pakistani tribal areas along the Afghanistan-Pakistan border and reveals how the area has fallen under the control of a resurgent Taliban militia. Despite the presence of 80,000 Pakistani troops, the Taliban and their supporters continue to use the region as a launching pad for attacks on U.S. and coalition forces in Afghanistan. Off limits to U.S. troops by agreement with Pakistan's president and long suspected of harboring Osama bin Laden and his deputy Ayman al-Zawahiri, the area is now considered a failed state. President Pervez Musharraf tells FRONTLINE reporter Martin Smith that Pakistan's strategy, which includes cash payments to militants who lay down their arms, has clearly foundered. In a region little understood because it is closed to most observers, FRONTLINE investigates a secret front in the war on terror.