Донна Мария де Гузман, одна из прекрасных дам Рондо, видит, как дон Диего дает публичную пощечину своему престарелому отцу. Под видом мужчины донна Мария вызывает дона Диего на дуэль и убивает его. Ей приходится покинуть город, и она путешествует, скрывая свой пол, в компании дона Хуана, одного из её поклонников.
Silvia Heredia, since her arrival to Madrid is staying at her best friends' house, Mary. Her aim is to work as a secretary of a famous novelist. But at night the house is full of people and they confuse her with the owner of the floor. A series of misunderstandings makes her meet Ricardo Ariaga, the musician whose opera "Life begins at midnight" is about to debut. Ricardo convinces Sylvia to act as his wife. With a "rented" child they try to be the perfect family of a lonely old man.
Isabel and Gonzalo, a marriage of high society, see how their happiness is endangered due to the frequent love affairs of the husband, that will eventually lead them to interact with a pair of cynical thieves dedicated to blackmail Isabel and to defraud Gonzalo in his business
