Maurice, a middle-aged man in a bad mental condition, arrives at a small train station. He is there to take a few days' rest with an old friend, a novelist, who lives in a cozy house in the middle of the countryside. Maurice tells his friend that he has an important appointment with a woman in Paris but that, being scared to meet her, he won't go. Aware that this meeting is determining for the future psychic balance of his friend (he himself wrote his first novel only after facing the woman), he urges him to take the appointment and, to support him morally, even accompanies him to Paris. The following morning, the two men board the train for Paris. Will Maurice manage to confront the mysterious lady?