To commemorate the passing of their beloved father, four brothers very much at odds congregate for one final week at their summer house in the Magdalen Islands. As they bid their final goodbyes, the four brothers revisit their past joys and hardships as each one of them struggles to give meaning to their very different lives.

Bête noire the collateral effects of an unforgivable act commited by Jérémy, a 16 year-old teenager. With the help of the psychiatrist-coroner in charge of the investigation, his mother tries to understand how her son, a seemingly normal boy, could commit such a heinous act. What caused this nightmare? When did everything change? Together, the two women try to solve the mystery of Jérémy.