When the police find Simone seated near her husbands corpse it is predictable that she is charged with the murder. Jean-Pierre Laubray is appointed counsel for the defence. He begins an inquiry into the case and he finds out that the murdered man had killed a barman in a robbery the night before. He finds out as well he was a leg-man of Cristianis for his election campaign. He tries to contact Juliette, Cristianis daughter, and he discovers that also Bruno, Juliettes brother, died that same night in a car accident...