 Yvonne (still dressed as Dolores) and Gomez arrive with the Duke, who goes to check on "Alvarado" (Columbo) in the tower.Gomez sings the serenade to woo "Dolores", attracting the attention of the Duke who, after discovering his mistake, vows that he has had enough of such adventures and returns to deal with "Alvarado".Yvonne reveals that she is not Dolores and enlists the aid of Gomez to save her father from the Duke.