The conflict is put into overdrive as Michael and Jimmy find common ground. Amanda proposes an unexpected partnership for mutual survival. Anthony and Nikita try to come to terms with the consequences of their actions.

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.

Bren's chaos reaches an apex, and the family is driven to mayhem. Michael and Viking both suffer heartbreak, while Uncle Frank seeks a change. The Batuks sew their own discord, and Amanda and Jimmy's son Anthony does the unthinkable.

Viking's allegiances are tested when the gardaí continue to question his girlfriend. Jimmy is unhappy with how Bren is going about the business. Bren seeks out Anna - very much against the wishes of Michael. Meanwhile, Birdy's past and present trauma begin to collide.

Viking is put in an impossible position as Bren puts his allegiances to the ultimate test this weekend. Amanda loses trust in part of the family, and the consequences begin to boil over. The Gardaí move closer to the Kinsellas, and Michael forges an intimate connection. As Frank grapples with his past and struggles with the return of Bren to the fold, things start to spiral. Nikita is cheered up by Viking with a bit of retail therapy.

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 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 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.

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 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.