In a small town near Marseille, Alain Quémeneur realizes that his 17-year-old son Basile is involved in the murder of a marginal person. Determined to do everything to save him from prison, Alain finds himself caught in a tragic face to face with his ex-wife and Basile's mother, Claire . Police commander, she leads the criminal investigation at the local SRPJ and ignores all the truth of which she inexorably approaches ...