Famous actress Renée Benoît is found dead after a party held in honor of the release of a new film in which she appears. The cause of death cannot be established even by a forensic expert. To determine whether it was murder, or not, the investigation is taken up by Commissioner Léon Bartès, who has recently returned to Marseille from a vacation in the Alps. He must find the true reason for the actress’s death—or find the killer among the guests…