The engineer Ambrus has been suspended in his job because he publicly called the attention of the customers to a construction mistake of some goods designed to be exported. His immediate boss learns the news on a business trip to Paris. He meets his old friend Lendvay, an emigrant from Hungary, and his French wife in a cellar bar. After their talk Benkő starts seeing things in a different perspective. When he returns home, he decides to take a stand for Ambrus against Ferenczi, the general director, despite his wife's and the old director's advice.