The film is a western adaptation of the Greek myth of Orestes, subject of three famous drama-plays by Aeschylus, Sophocles and Euripides.

[3] A wounded man by the name of Rafael (Peter Martell) shows up one day at the home of loner Sebastian (Leonard Mann).

Fifteen years earlier, Sebastian's father, Mexican general Juan Carrasco (José Suárez), was murdered by his treacherous wife Anna (Luciana Paluzzi) and her lover Tomas (Alberto de Mendoza) as part of a plot to take over the hacienda for themselves.

Sebastian's sister Isabella (Pilar Velázquez), however, witnessed Anna kill Juan and was forced by Tomas into a marriage with shopkeeper Juanito (Luciano Rossi), who is a meek but kind man who only wishes to make Isabella happy and tries to convince her to run away with him, but she refuses, preferring to stay in order to spite and torment her sinful mother.

In shock, Isabella walks upstairs to the very spot where she witnessed the death of her father fifteen years ago and starts laughing hysterically.