Charming Mimi-Trottin is in love with typographer Louis Chausson, nicknamed Godasse. She meets Doudou, actually a Vicomte, estranged with his parents who are rich automobile manufacturers. Godasse abandons Mimi because of his professional ambitions and Doudou rescues her from a suicide. After making peace with his parents, the young man has Mimi hired as a typist at the factory. After winning a race with one of his father's car, he soon wins the heart and the hand of Mimi.
M. et Mme Noblet, sans cesse au bord de la faillite, ont deux filles, la rieuse Lili et la prévoyante Françoise. Lili aime un jeune avocat, Napoléon Couture. Mais, pour sauver ses parents de la catastrophe, elle épouse un riche quadragénaire. Françoise décide de se substituer à sa sœur pour le mariage mais tombe amoureuse d'un ingénieur.