2/3. The Hunt for America's Sleeper Cells. In the days after the 9/11 attacks, as America woke up to the fact that an al-Qaeda cell had been operating undetected inside the country for months, the FBI set up the Joint Terrorism Task Force. Its brief was to track down al-Qaeda terrorists before they could launch even more deadly assaults. But the challenge now for security services was how to fight the enemy without riding roughshod over civil liberties.
Series producer Martin Wilson ; Executive producer Fiona Stourton