Investigating magistrate Sophie learns that Juliette, a woman who she is questioning in regards to an ongoing case, is the biological mother of Léo, her adopted son. Despite her magistrate husband Olivier's disapproval, Sophie refuses to withdraw from the case so that she can continue her probe on her, whilst hiding the truth from Léo. Appalled by Sophie's decision, Olivier decides to secretly approach Juliette without revealing his true identity and ends up going to bed with her.