Stéphane decides to move to the beautiful mountains of Cantal in order to reconnect with his 8-year-old daughter, Victoria, who has been silent since her mother's disappearance. During a walk in the forest, a shepherd gives Victoria a puppy named "Mystery" who will gradually give her a taste for life. But very quickly, Stéphane discovers that the animal is in reality a wolf… Despite the warnings and the danger of this situation, he cannot bring himself to separate his daughter from this seemingly harmless ball of hair.

Louise de Pileggi, a brilliant assistant district attorney, has always had a complicated relationship with her mother, Judith, whom she hasn’t seen in 15 years. When she is transferred to the small courthouse where Judith works as a court clerk, Louise becomes her mother’s boss. And worse still: they will have to work together on a case that seems trivial at first glance, but which will put their nerves on edge.