Maria-Pilar is the new wife of an Algerian gangster whom the police have just arrested. The son of a first marriage arrives in Algiers from which he has remained far away for a long time. His stepmother, charmed by the teenager, gradually experiences a devouring passion, against which Michel tries in vain to fight: he loves a young girl, Sylvie. Mad with jealousy, his stepmother singles him out for his father's vengeance by distorting the truth. Michel does not escape his father's fury, but when the woman's deception becomes known, Maria-Pilar is strangled to death.