A wealthy man comes to Buenos Aires to avenge the death of his young brother. He starts a relation with a suggestive blonde singer from a nightclub run by a mafia boss. One of the musical numbers is made by Michelle, a well-known American transvestite and is the first appearance of a transvestite in an Argentine film, something daring for the time.
Pursued by an infamous song that makes her life impossible, Dolores leaves Calatayud.
A valet impersonates his lord and must face the difficulties of this deception in society.
