A hilarious comedy of errors starring Dolly Haas: Annie, the locksmith's daughter, and Georg, a car salesman, meet at the fair but quickly lose touch. Later, Annie is tasked by her father with delivering new locks to a countess's castle. At the train station, she is mistaken for the countess's niece, whose arrival is imminent. She is taken to the castle in a magnificent carriage and encounters Georg again, who is out for an unauthorized joyride in a stylish car. Each now believes the other to be extremely wealthy. When the real countess arrives at the castle, she enjoys playing along with the charade and poses as her own companion, with whom Count Egon falls in love. After the confusion is resolved, there are two happy couples.