Katel Leguennec has to investigate a series of murders linked to a wine estate and the legend of Sainte-Odile, a young girl born blind. She must team up with Maxime Keller, who is at the same time her first love and the son of her husband.

While he is about to host a tasting of a special cuvée of Alsatian wine, Julian Mathis, the young heir to the prestigious Clos-Mathis vineyard, discovers his father's body in a tank with his eyes glued shut . Katel Leguennec, chief of Strasbourg's criminal police has to lead the investigation with her former boyfriend Maxime Keller, head of the forensic medical department. It unveils clues leading to the legend of Siant Odile, a young girl born blind and abandoned by her parents who went on to become the patron saint of Alsace.