He was the New IRA 'fixer' with an unclear past, but despite some red flags, Dennis McFadden managed to infiltrate the terror group and win their trust, all the while reporting back to MI5.
For two decades the Scottish spy worked and lived in Belfast and moonlighted as an ordinary married man who moved in dissident republican circles.
But when he disappeared last August panic ensued - and now 10 suspected dissidents are in the dock charged after an intricate bugging operation into their group,
Nicola Tallant chats with Allison Morris, crime correspondent and columnist with the Belfast Telegraph, about the two faces of MI5's Chameleon man
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