(French; English subtitles) Omar Sy (The Intouchables) is Knock, a former thug turned doctor, who arrives in the small village of Saint Maurice to make his fortune according to a particular method: convincing the villagers that they are not as healthy as they might think. For that he will find in each one a real or imaginary illness of which he suffers. A past master in the art of seduction and manipulation, Knock gains the confidence of the village and is about to achieve his ends, when his past catches up with him and an old acquaintance disrupts the doctor's plans.