After indulging in an affair with a man (a friend of the family) she truly loves, a woman returns to her young son and husband for good, and loses contact with the man. Her husband is unaware of the affair. Twenty years later, there is news that the friend has died and left all of his money to the younger son in the family, which leads us to question this younger son's biological origin.

Rosario Granados
as Rosario

Tito Junco
as Julio Mistral

Julio Villarreal
as Don Carlos Montero

Joaquín Cordero
as Carlos

Xavier Loyá
as Miguel

Elda Peralta
as Luisa

Jaime Calpe
as Carlitos

Eva Calvo
as Rita, enfermera

Miguel Manzano
as Doctor

Ricardo Adalid
as Cliente de Carlos (uncredited)