A peculiar neighbor offers hope to a recent widow who is struggling to raise a teenager who is unpredictable and, sometimes, violent.

Following a rare accident, Paul Sneijder opened his eyes to the reality of his life as a "senior manager" in Montreal: his work no longer interested him, his wife annoyed him and deceived him, his two sons despised him ... How can we continue to live under these conditions? Starting with a change of profession: dog walker for example! Will his relatives accept this change that will turn him into a free man?

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.