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.

David Wozniak is a perpetual adolescent who discovers that, as a sperm donor, he has fathered 533 children. He is advised that more than 100 of his offspring are trying to force the fertility clinic to reveal the true identity of "Starbuck," the pseudonym he used when donating his sperm. To make matters worse, his girlfriend Valérie is pregnant with his child, but doesn't feel that he is mature enough to be a father.