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 deal with the fallout of the Cunningham's relatiation, Frank attempts to avoid an all-out war, while Michael is torn between helping Jimmy seek his revenge and staying above the fray so he can see Anna again.

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.

The walls close in; the Kinsellas are blacklisted by Eamon Cunningham, but necessity is the mother of invention; Amanda pitches an idea to force Cunningham back onto his heels.

The Kinsellas strike back at Eamon Cunningham as Amanda starts to blame others for Jamie's death; Michael unintentionally puts Anna in danger; the endgame starts to take shape.

Frank and Eamon deal with the stress in different ways, as Amanda continues to anger the rest of the family with her dynamism.

Frank visits his brother, Bren, in jail and remembers why his brother is not a man to be trifled with; danger lurks around every corner; Amanda and Michael come to a realization.

Eamon and Amanda meet to discuss a way to end the war; the proposal does not go over well with Frank; Jimmy and Michael meet at a crossroads; the family gathers for Jamie's memorial service.