Sean Duffy's got nothing. And when you've got nothing to lose, you have everything to gain. So when MI5 come knocking, Sean knows exactly what they want, and what he'll want in return, but he hasn't got the first idea how to get it.
Of course he's heard about the spectacular escape of IRA man Dermot McCann from Her Majesty's Maze prison. And he knew, with chilly certainty, that their paths would cross. But finding Dermot leads Sean to an old locked room mystery, and into the kind of danger where you can lose as easily as winning.