A year in the heart of the school of the republic, of life... and of shit! Samia, a young, novice CPE, arrives from her native Ardèche in a college reputedly difficult in the town of Saint-Denis. She discovers the recurring problems of discipline, the social reality weighing on the neighbourhood, but also the incredible vitality and humour of both the students and her team of supervisors. Among them are Moussa, the neighborhood big shot, and Dylan the roomer. Samia adapts and soon takes pleasure in channeling the most disruptive of impulses. Her complicated personal situation naturally brings her closer to Yanis, a bright and intelligent teenager whose potential she has sensed. Even if Yanis seems to give up all ambition by hiding behind his insolence, Samia will invest all her energy to divert him from a forecasted school failure and try to bring him to project himself in a better future...