In the final programme, Peter Taylor tells the story of Osama Bin Laden's declaration of war on the West.
In 1998, a truck bomb exploded outside the American embassy in Nairobi. Over 200 people died and thousands were injured.
The film tells the survivors' story with moving interviews and archive.
It also features an extraordinary interview with the FBI agent who tracked down and questioned a suspected al-Qaeda bomber.
It was Osama Bin Laden's first major strike in his jihad against America.
The programme provides important insights for anyone trying to understand al-Qaeda's methods of creating terror to this day.