Tired of her parents' constant arguments, 12-year-old Justine and her friends do everything they can to make them divorce.

Drowning under the abuses of her narcissist ex husband and condescending Lotto-Gold superior, a young single mother on the brink of a mental breakdown is sent to the middle of nowhere to interview a strange hermit.

When Maria thinks she's at the bottom of the barrel, she discovers that this barrel has a double bottom: no job, no money, no worthy accomplishment and now a dying mother begging her to do something with her life. before his death! She has no other choice but to get back in hand and find a career ... But what can she do with a 7-year-old BAC in communication and no work experience? Believe it or not, she can become a substitute in a high school! Thus, Maria, 30, as responsible and stable as a 14-year-old teenager, returns to high school in the role of the one to whom she threw pieces of erasers: the replacement. Too jaded teachers, rebellious teenagers, intimidated or not sufficiently denounced, she will be confronted with the reality of teachers and young people today and, who knows, may discover a vocation.