In the parking of a supermarket, the corpse of Jérémy Nogent, 32, married and father of a little baby, sports teacher at Jean Moulin school, is found dead from a blow to the head, but the murder weapon is missing. His wife Myriam had reported his disappearance. Allegedly, he went kitesurfing and did not return, but Constance thinks that mistral wind and rough seas were not suitable for surfing. Myriam declares he had an argument with Philippe Choppard, history teacher, who despised and humiliated Jérémy in public.