With only 12 percent of its pupils obtaining their baccalaureate, Jules Ferry High School is the worst school in France. The Inspector of Schools has already exhausted all the conventional means to raise standards at the school and he has no choice but to take the advice of his deputy. It is a case of having to fight fire with fire: the worst pupils must be taught by the worst teachers...
The film tells the story of a gentleman of a certain age, a distinguished homeless, who becomes the mentor of a young girl of 20. He will keep out of trouble, especially when she’s about to marry a fool. He will try to change her life by making it more beautiful in the manner of a guardian angel.