The movie is a co-production between Spain and Mexico, directed by Tito Fernández and starring Hilda Aguirre, Manuel Gil and Enrique Guzmán.
In fact, her many existential questions and a strange emptiness she feels in her life suddenly compel her to enter a convent as a novice.
The convent is also a children's hospital and Maria meets a doctor (Manuel Gil) with whom she has a personality clash although they develop a mutual liking and respect.
After asking permission from the Mother Superior and the bishop, Maria decides to compete in the Sanremo Music Festival, thinking that the first-prize purse will be enough to save the convent forever.
A few years later she rose to stardom in Mexico, and Enrique Guzmán revealed in an interview that Estela Núñez was the real singer in the film.