Ten years ago, the prestigious suburban community of Beaconsfield, Quebec was shaken by the discovery of the bodies of an ordinary couple in their home. What appeared to be a common murder-suicide—husband kills wife and takes his own life—has baffled two previous investigations. At one point, the son, who had a tumultuous relationship with his father, was considered a suspect. Lieutenant Detective Toni Damiano and her partner, Detective Pierre Matte, attached to the newly-created Cold Case Unit, have reopened the case with their usual confidence and grit. They are met with unexpected challenges and a reality they’ve never had to face before.