Finally the voice of Caramello is heard from the gondola singing the gondolier's song. Delacqua helps into the gondola the masked figure he believes to be his wife and he bids her farewell as the Duke looks on with keen anticipation. A group of sailors appear and, with Enrico at their head, they sing a serenade to Delacqua for his birthday the following day. While Delacqua is on the balcony thanking the singers, Barbara slips out to join Enrico. The birthday serenade merges with the sound of Caramello's gondola song as night falls on Venice and the disguised Caramello glides away with his masked sweetheart Annina, neither knowing the true identity of the other.