The Kinsellas are a small but tight-knit crime family in Dublin, Ireland, increasingly at odds with a powerful drug cartel. When the hotheaded son of Frank Kinsella gets into a violent confrontation with one of Eamon's men, the Cunninghams retaliate.

The Kinsellas bury one of their own as they prepare for an all-out war against the Cunninghams, Michael and Jimmy set a plan in motion for revenge, and Amanda orders her first hit.