Louise Denoncourt, a parole officer, skillfully operates an experimental rehabilitation wing for criminals who have committed homicides. When she finds herself in front of Marc St-Germain, a new inmate whom her father suspects of being her mother's murderer, she embarks on a mission that quickly overwhelms her. She then puts everything at stake, even her life, in order to prevent any desire to reoffend. But will she be overtaken by the desire to avenge her family history?

As they make their way to Schefferville, an isolated village in Northern Quebec, to settle the sale of a cottage, Sophie and Mathieu unwittingly find themselves facing a grave and unexpected situation that tests their relationship.