This drama is adapted from the non-fiction work "Tower of Doom: Al-Qaeda and the Road to 9/11". On September 11, 2001, the United States suffered the worst terrorist attack in history. Four Boeing passenger planes were hijacked and crashed into the Twin Towers of the World Trade Center and the Pentagon, resulting in the deaths of more than 3,000 people and hundreds of billions of dollars in economic losses. Lawrence Wright, a reporter for The New Yorker, embarked on a long reporting journey, an in-depth report that lasted five years and more than 500 pages. About the relationship between the CIA, the FBI, and Al-Qaeda.