A young girl, Gaby, advertised in a newspaper to find a husband. Berthier, director of a telephone exchange, answered it. Yvonne, a charming telephone operator, has been invited by a subscriber, Vanetti, a married man looking for entertainment in the absence of his wife. The four young people have agreed to the same meeting place and will find the wrong partner. Gaby will spend the evening with Vanetti and Yvonne with Berthier.

Auguste Chantilly leads a well-regulated life in the countryside, watching over his ward, the young Arlette. But in the city, he becomes Hubert, and leads a much happier life. Arlette is very keen to get to know this Hubert whom she thinks is her tutor's brother, and things get complicated.