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.

This is the first espisode in a special four part series. McGartland talks about his childhood, how his 12 year-old sister was recruited into the ranks of the IRA and describes how a hatred for terrorism saw him groomed by the British security services. 

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