Vittorio, the prince of a small state, finds himself at a magnificent Venetian ball hosted by his friend Marcello. Vittorio desperately opposes the wedding with the Countess that his father chose for him. And now he wants to relax. In the crowd of vacationers, the prince unexpectedly sees a beauty who clearly felt confused in the huge crowd. He decides to meet her, and mutual passion flares up from the very first minute. But Vittorio still doesn’t know that Rosa, his new friend, is a simple maid in a hotel...