Episode 4
- Episode aired Oct 1, 2019
At the end of the Seventies, the IRA built its own internal security system to root out informers. But British intelligence found a fatal flaw that unlocked many of the IRA's secrets.At the end of the Seventies, the IRA built its own internal security system to root out informers. But British intelligence found a fatal flaw that unlocked many of the IRA's secrets.At the end of the Seventies, the IRA built its own internal security system to root out informers. But British intelligence found a fatal flaw that unlocked many of the IRA's secrets.