Paolo, a professor in Florence, was abandoned by Sena, his ex-student, with whom he had lived for many years. She did not give him any explanations and all the attempts made by him to see her again proved useless. Finally, when she is about to leave for Paris to study, she asks him to take her back to the station. The two separate between tears with the promise of meeting again in France. So he reaches Versailles to find her, however, he sees her with a young man named Domenico arm in arm. In the grip of a real psychosomatic crisis, an early aging, Paul returns to Florence, where she reaches him. It seems that everything is back in place between the two, who make a long journey in the Mediterranean Sea, even experiencing a shipwreck. During the journey, however, she reveals to him the reason of her leave.