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.