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 retaliation, 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.
Amanda is hellbent on making Viking pay for his actions, Eamon takes part in an Ayahuasca ceremony with his ex-wife and Michael has another ill-fated meeting with his daughter.
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 realisation.