Doctor Knock is a former thug who has become a doctor and arrives in the small village of Saint-Maurice to make his fortune according to a particular method. It will make the villagers believe that they are not as healthy as they might think. It is thus that he will find in each one an imaginary symptom, or not, and thus will be able to exercise his profession lucratively. Under his seductive looks and after gaining the confidence of the village, Knock is on the verge of achieving his ends. But his past catches up with him and an old acquaintance disrupts the doctor’s plans.

A doctor is shot in the back in her home, her husband is murdered and her infant daughter kidnapped. Faced with inept police, who at times suspect her, she begins her own hunt for her baby and the culprits.

When Ilan Halimi is kidnapped for ransom because Jewish and supposedly rich, his family and the police start a race against time to save him from the tortures of the “gang of barbarians”.