Roger Blanchard has a busy life. On the family side, he is married and has two children, aged ten and fifteen. On the work side, he holds an important position at the Ministry of Culture. To bolster his social status, he has a mistress to liven up his Saturdays. But nothing is going right. His wife Marion exasperates him, his children irritate him, his job gives him no real satisfaction, his mistress neglects him and his superior, Monsieur Gambaud, gets on his nerves. But when he meets a beautiful young secretary, his life and habits are turned upside down: Blanchard amuses him and gets his way. In revenge, Gambaud warns Blanchard's wife.