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.

It's Christmas in the beautiful French village of Sainte Victoire, and Jean is looking forward to spending the holiday season with her new friends, but the festivities are short lived when the chief of police Andre Caron's wife is brutally murdered.