Amélie Florot, a successful parisan lawyer specialised in women rights, is found drowned in Saint Agatha fountain, an historic pilgrimage place for nurses from Morvan.
Native from the area, the young woman hadn't been there for about twenty-five years.
For the two detectives, Maud Perrin, lieutenant and a local organic farmer's daughter, and Julien Demarcy, arrived from Dijon, the mystery thickens when they find out that Charlotte Florot, the victim's grand-mother, is dead by drowning at the same place eighty years earlier !
Family malediction or macabre coincidence ? To clear this case up, the detectives find themselves in the middle of old rivalries that are going on for decades between two local families: the Sénéchals and the Florots.