Investigating judge at the 3rd Criminal Chamber of Marseille, Françoise Larchey is the wife of Jean-Pierre Larchey, a famous architect of the Coast. The couple has a son, Valentin, seventeen years old... The death of Edith Mesniel, a local political figure, puts the town in turmoil. But when Emilie, Edith's only daughter and Valentin's girlfriend, confides to Françoise that her mother's death was not accidental, Madame le Juge decides to look into the case. By attacking this case, Françoise disturbs many people. She receives death threats, her son and Emilie are also threatened but she refuses to give up. And she discovers little by little that the mafia infiltrated in all the country.