4/7. 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.
3/7. Jennifer OLeary uncovers IRA arms connections around the world and charts how republicans built a political strategy in parallel with their armed campaign. [S]
2/7. New revelations about how the IRA went from anticipating victory to fighting a bloody, long war against Britain, with Gerry Adams emerging as the republican leader of his time. [S]
1/7. Northern Irelands leading team of investigative journalists reveal important new discoveries about the outbreak of the conflict known as the Troubles, 50 years after troops were deployed. [S]