François Foucault, la quarantaine est professeur agrégé de lettres au lycée Henri IV, à Paris. Une suite dévènements le force à accepter une mutation dun an dans un collège de banlieue classé REP +. Il redoute le pire. A juste titre. Teacher in the most prestigious highschool in the country, François enjoys the life he’s always known, in the intellectual and bourgeois society of Paris. Trapped in a situation where he’s forced to accept a job in a school of a tough underprivileged suburb, he finds himself confronted to his own limits and to the upheaval of his values and certainties.