Former paramilitary killer Gerry Fegan wanders New York City, hiding from a past he escaped at terrible cost. But he made a fatal mistake: he spared the life of Bull O'Kane, a ruthless man who will stop at nothing to get his revenge. Too many witnesses survived a bloody battle at his border farm, and now he wants them silenced, whether man, woman or child. O'Kane calls the Traveller, an assassin without pity or remorse, a killer of the purest kind.

Back in Belfast, Detective Inspector Jack Lennon, father of one the witnesses, is caught up in a web of official secrets and lies as he tries to uncover the whereabouts of his daughter. The closer he gets to the truth about the events on O'Kane's border farm, the more his superiors instruct him to back off.

When Fegan realises he can't shake off the trail of violence that has followed him across the world, he has no choice but to return to Belfast and confront his past. The Traveller awaits Fegan's return, ready for the fight of his life.

A fast-paced thriller about duty and revenge, Collusion is the blistering sequel to The Twelve, one of the most highly acclaimed debuts of recent years.