Irish travellers live in a closed community. What we think we know about them is based on hearsay, rumour and stereotype. But not any more. Knuckle is the true story of James Quinn McDonagh - clan head and champion bare-knuckle fighter. It's a journey from his grandfather's horse-drawn caravan at the side of the road to the country lanes of Ireland where he stood, fists bloodied and bandaged, fighting a clan war that he never asked for.