Nora leaves the convent where she has been raised to marry a relative. Just arrived she has an accident resulting in total amnesia. Her identity mistaken a new life begins for her, where she will encounter love, adventure and even crime.

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.