'Sean Duffy knows there's no such thing as a perfect crime. But a torso in a suitcase is pretty close.

'Still, one tiny clue is all it takes, and there it is. A tattoo. So Duffy, fully fit and back at work after the severe trauma of his last case, is ready to follow the trail of blood - however faint - that always, always connects a body to its killer.

'A legendarily stubborn man, Duffy becomes obsessed with this mystery as a distraction from the ruins of his love life, and to push down the seed of self-doubt that he seems to have traded for his youthful arrogance.

'So from country lanes to city streets, Duffy works every angle. And wherever he goes, he smells a rat ...' (Publisher's blurb)

'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.

'From old betrayals and ancient history to 1984's most infamous crime, Sean tries not to fall behind in the race to annihilation. Can he outrun the most skilled terrorist the IRA ever created? And will the past catch him first?' (Publisher's blurb)

'Belfast, 1985. Gunrunners on the borders, riots in the cities, The Power of Love on the radio. And somehow, in the middle, Detective Inspector Sean Duffy is hanging on, a Catholic policeman in the hostile Royal Ulster Constabulary.

'Duffy is initially left cold by the murder of a wealthy couple, shot dead while watching TV. And when their troubled son commits suicide, leaving a note that appears to take responsibility for the deaths, it seems the case is closed. But something doesn't add up, and people keep dying. Soon Duffy is on the trail of a mystery that will pit him against shadowy US intelligence forces, and take him into the white-hot heart of the biggest political scandal of the decade. ' (Publication summary)

'I’s just the same things over and again for Sean Duffy: riot duty, heartbreak, cases he can solve but never get to court. But what detective gets two locked-room mysteries in one career?

'When journalist Lily Bigelow is found dead in the courtyard of Carrickfergus castle, it looks like a suicide. Yet there are just a few things that bother Duffy enough to keep the case file open. Which is how he finds out that she was working on a devastating investigation of corruption and abuse at the highest levels of power in the UK and beyond.

'And so Duffy has two impossible problems on his desk: Who killed Lily Bigelow? And what were they trying to hide?' (Publication summary)

'Belfast 1988: a man has been shot in the back with an arrow. It ain't Injuns and it isn't Robin Hood. But uncovering exactly who has done it will take Detective Inspector Sean Duffy down his most dangerous road yet, a road that leads to a lonely clearing on the high bog where three masked gunmen will force Duffy to dig his own grave. Hunted by forces unknown, threatened by Internal Affairs and with his relationship on the rocks, Duffy will need all his wits to get out of this investigation in one piece.' (Publication summary)