This is the second espisode in a special four part series.

During the Northern Ireland Troubles, Martin McGartland was one of MI5's most priceless assets. 

Born into a staunchly republican family in the IRA heartland of west Belfast in the 1970s, the British spy, codenamed Agent Carol, went on to infiltrate one of the most feared and ruthless terror gangs in the world.

He stopped shootings, bombings and murders but his fearless undercover activities came at a price.

Now living in exile under a secret identity, McGartland gives his most indepth and explosive interview to date. And he reveals how MI5 ended up treating him worse than the IRA who tried to murder him - twice.

In this episode, McGartland talks about his double life, being involved in the IRA murder of a British soldier on leave from his London regiment to visit the Belfast woman he planned to marry. He also talks about foiling what would have been one of the IRA's biggest massacres in its history and how it almost cost him his life.

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