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!

In Montmartre, prostitutes and neighborhood pimps meet in Victor's bar. One of them, Charly, one day falls in love with the beautiful Laurence, a girl who honestly earns her life as a singer. But Fernand, the local boss, sees a bad eye his acolyte out of the ranks to lead a quiet life in the company of his sweetheart. He provokes the jealousy of Jessy, mistress of Charly. The latter, stung, does not intend to leave without fighting his lover take the tangent. She ruminates her revenge so much that she ends up shooting Charly ...