Antoine Rethel, a police inspector, meets a young woman to whom he has just prevented a traffic accident.To thank him, she invites him to drink at her house.She commits suicide a few moments later in the bathroom with her service weapon.Antoine swears to himself that he won't say a word about this dirty story and returns home. The next day, driven by curiosity, he decides to return to the scene of the tragedy...surprise, the corpse is no longer there...Antoine is not at the end of his troubles...the next day, he returns to the house and discovers another corpse in the bathtub...little by little, he sinks into a crazy story full of murders...He must hurry to elucidate the murders before it's too late.