Jean Fleury, a young engineer who has designed a revolutionary engine for the Revoil motor company, is engaged to Aimée Valois, a seamstress, his neighbor across the hall. But the charming young lady is hired one day by a nightclub and lets herself be lured by the easy life in Paris. So much so that, to Jean's great distress, she breaks up with him. But, along with time, Aimée gets tired of her vain and frivolous lifestyle and comes back to Jean.

In a daydream, a shy bank clerk is led by a fairy into a subterranean world where people transform into animals and waxworks come to life. Lucie, his office crush, follows him but a bad fairy is intent on keeping them apart.

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.

A young student breaks off her engagement after her late mother leaves her with a baby she had with a stranger. But the baby's father returns and claims it. The young girl, her life shattered, tries to commit suicide but her fiancé, who has never stopped loving her, arrives in time.

After his engagement party with beautiful Aline, Claude, a struggling writer, meets his two closest friends. The trio sets up a daring publicity stunt, involving a fake murder. The scheme backfires as the fake victim gets really dead.