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.