On a cold winter in Clermont-Ferrand, France, a solitary engineer named Jean-Louis, a man of strong convictions and somewhat orthodox in his beliefs, finds himself facing a love dilemma. After a series of casual encounters, he becomes ensnared in an unexpected emotional triangle when he is invited to spend the night at the apartment of Maud, a seductive and challenging woman whose view of life is completely opposite to his.
Maud, an independent and open-minded divorcee, becomes the center of a psychological game where the notions of love, faith, and morality are questioned. As they converse, Jean-Louis feels drawn to her provocative ideas, prompting him to reconsider his own decisions and the path he has chosen to follow. In the background, there is a third figure: Françoise, a young woman with whom Jean-Louis has a more conventional relationship, but who seems less intriguing compared to the provocative Maud.
The tension rises throughout the night, where the dialogue evolves into both an intellectual duel and an emotional twist. Amid laughter, philosophical debates, and personal revelations, the night transforms into a journey of self-discovery that will force Jean-Louis to confront his fears, desires, and, above all, his own identity. In an intimate setting that brings his innermost thoughts to light, the choices he must make become more complex than he ever imagined.