Electra es una joven de padre desconocido, criada en un convento en Francia y que, tras la muerte de su madre Eleuteria, es acogida por su tía Evarista y el marido de esta Don Urbano. Electra se enamora perdidamente del científico Máximo, un sobrino de Evarista. Sin embargo, don Salvador de Pantoja le confiesa a Electra que Máximo y ella son hermanos de madre por lo que Electra, presa de sus temores, se refugia en un convento animada por Pantoja. Allí, Eleuteria se le aparece para revelarle que los rumores que la atormentan son totalmente falsos y le aconsejará abandonar el convento en el que le augura la infelicidad. Electra is a young lady who does not know her father. She was raised in a French convent, and, after the death of her mother, was adopted by her aunt Evarista who is married to Don Urbano. Later, Electra falls deeply in love with Maximo the scientist, Evarista's newphew. However, Electra finds out that she and Maximo have the same mother. Terrified of her own feelings, she flees to a convent. There, Eleuteria appears to her and informs her that the rumor was a lie. She advises her to leave the convent and seek happiness.