Pierre Verger is a quick-tempered Paris taxi driver (excuse the pleonasm!). On the other hand , he is a good family man concerned about his nearest and dearest. Married to Hélène, he has two children, Georges, a journalist and womanizer, and Jacqueline, a seamstress, engaged to a serious-minded, naive artist/delivery man. He has also a a brother-in-law, who is a policeman outside home and a henpecked husband inside. But his closest companion is "Gangster", a young dog, who shares his days of work as well as his aversion to law enforcers. Pierre`s main preoccupation is to provide his next of kin with a comfortable life but he finds it hard to make ends meet. This is the reason why he is faced with a moral dilemma when a client, an Italian woman whose address he can`t find, leaves her bag in his taxi with 300,000 francs in it. Will usually honest Pierre keep this large sum of money or bring it to the police?