Borderline, a film version of the novels Borderline and La Brèche, tells the story of Kiki at various stages of her life. With her mother institutionalized, she is raised by her grandmother, where left to her own devices, she takes refuge in school. Her life before 30 is a far cry from fairy-tale. Sex and alcohol are her only outlets and her daily reality. She goes through men one after another.
Juliette, 15, is the only child of an eminent judge and has had the best of education in the best of schools. Her father is in the limelight because he’s been chosen to preside over one of the most important trials of the past 10 years: the case of Réal Lamontagne, a notorious criminal accused of killing a child. Roméo, 17, is the son of the accused. Even though they come from diametrically opposed universes, Juliette and Roméo fall for each other.