An Italian adaptation of the Richard Wagner opera Lohengrin, where a woman prays for a saviour, and receives it in the form of the title character, a man who will marry her and stay by her if she never asks him his name.

In the year 1914: The assistants of cobbler Lehmann compete for the affections of his daughter Frieda. Actually she’s in love with her ambitious cousin Fritz, but the cunning Franz knows how to string her along. When Fritz gets drafted, Frieda gives in and marries Franz. Soon Fritz is declared missing and the old cobbler dies of grief. Along the way Franz, who dodged the military service, earns his money with large-scale racketeering. Frieda is miserable. But then Fritz returns from Soviet captivity, prompting Frieda to divorce Franz. Finally Frieda accepts an inheritance from the USA and marries Fritz. With the money they open up a shoe store.