An elite CIA team was prevented from acting on intelligence to stop the 9/11 attacks… just hours before the planes took off from Logan airport. In the aftermath of the tragedy, many lower level operatives were reassigned and the team was dismantled. Years later, the CIA has created a secret unit known as Echelon 8. Approved by a congressional shadow committee known only as "The Keepers," E-8’s purpose is to carry out controversial surveillance… on their own country.