Judith and Jeremy throw a 1980s themed 35th wedding anniversary party. Jeremy's brother and sister-in-law, Harry and Cressida, and Judith's sister, Mary attend the party.

Caron enlists Jean and Dom's help when a valuable relic from the local church is stolen, and priest Father Donadieu is discovered murdered. Meanwhile, the Connors have an eventful week when Niall's mother Niamh pays a visit and it quickly becomes apparent that she and Celine are not on amicable terms.