In a feudal village, Don Diego (Antonio Ferrandis) rules over the land while maintaining a sexual relationship with the miller, Elvira (La Polaca). Elvira's beautiful daughter, Elena (Amparo Muñoz), catches the sexual obsession of Don Diego's son and heir, Gonzalo (Simón Andreu). However, Elena is secretly the illegitimate daughter of Don Diego as well—making her Gonzalo's half-sister. To put a stop to the illicit, incestuous fixation between the siblings, Elvira marries Elena off to Rodrigo (Pedro Mari Sánchez). Despite her marriage, Elena continues to long for Gonzalo, leading to a secret, consensual extramarital affair between the half-siblings that spiralling into family tragedy.