During the annual party given at the Château de la Rochefoucauld, near Angoulême, a bloody crime is committed. The victim is Cédric De Breuil, a renowned entrepreneur, husband of Countess Louise de Camaran. A woman that Alex Meurisse, the commander in charge of the investigation, seems to know very well. In fact, twenty years earlier, Louise and Alex lived a love story, stifled by Louise's parents, who did not see very favorably this relationship between their daughter and the son of the steward of their area of the time. Alex, supported by Lieutenant Sarah Slimani, returns to the places of his childhood, and cannot hide his emotion when he finds Louise completely devastated...