Malou, a prostitute from Montmartre, and her pimp, have found a well laid scheme : whenever she (or he) wants to get rid of a lover, she announces to him in a tearful voice that she is pregnant. The reaction of the fall guy-is invariable: he gives her compensation money and disappears. But there is always an exception to the rule. And, as it happens, the exception is a widowed insurer, Monsieur Archibald. Indeed when he is told by Malou that he is going to be a father, he is...elated!