Pierre Hamp

A train driver has not slowed down at a signal and caused an accident whose victim is a gatekeeper. Two inspectors come to investigate the affair. During his interrogation, the driver refuses to provide an explanation for his action and is charged with malpractice. The only one he will tell the truth to is the gatekeeper's wife.

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.