When a young teen marries the Prince of Cleves, more than twice her age, she automatically becomes an official Princess and takes her new position to heart. Although distracted by the elite entertainments found at court, the princess cannot help but mourn her impossible love for the dashing Duc de Nemours.

Meant to be a psychological study of a dysfunctional couple and an equally unbalanced maid, this slow-paced, murky melodrama stars Michele Morgan and Robert Hossein as Thelma and Jess, two Americans who move into a down-at-the-heels Paris neighborhood. The couple is still suffering from the loss of their only son in an automobile accident that happened some time in the distant past. Thelma tends to drown her sorrows in alcohol, while Jess is introspected and morose. After they hire a maid to help out with the housework, she falls for the taciturn Jess. Her interest seems to be only a simple attraction, yet appearances, as it turns out, are deceiving.

There is a lot of excitement in the high society of Venice: An Arab prince, who always travels incognito, is said to be in the city. By chance, the elegant Isabella gets to know the handsome heir to the throne - and it does not take long for her to fall madly in love with him. Isabella has no idea that her dream man is really the impostor Gérard, who looks remarkably like the prince and was hounded by the sleazy crook Alfredo on Isabella to steal their precious jewelry.