A teacher of philosophy encounters a complicated pupil; a seventeen year old girl who possesses quite a cynical view of the world. He attempts to help her focus on her studies, but soon becomes fascinated by her. They fall passionately in love. When the teacher is forced to choose between her and his Wife, complications ensue when the Girl refuses to accept his decision.
Francois, 49, is a happily married teacher. Concerned that rebellious student Mathilde is going to be expelled he sets out to help her but is soon drawn into a passionate relationship with her which has devastating consequences.