La Femme d'une nuit (1930)

A lieutenant of the French navy, ready to kill himself in despair, renounced his project after spending a night with a beautiful stranger. He ends up finding her, the heiress princess Lystrie. The German version (Königin einer Nacht) was an operetta, the Italian version (La donna di una notte) was a comedy, while the French version (La Femme d'une nuit) was a dramatic film.