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One day an investigator (Augusto Benedico) knocks on a convent's door. He is looking for a nurse named Rosa Rivero who turns to be a novice.

Based upon the book El Otro Hermano, by Spanish Julio Alejandro (one of Luis Buñuel's script writers) this story develops at tiny island Isla de Lobos, Veracruz. Rosa Rivero (Marga López) is married to Melchor (Ramón Gay) the lighthouse keeper. María (Lilia Prado) is married to his twin Rafael (Ramón Gay, also) and they have a kid named Pepito. María is younger than Rosa, but also beautiful and sensual, besides she wishes her in-law. Rosa, a good-hearted woman, is aware of this, so she has decided she and her man will leave the island.

One day the men go fishing on boats but that afternoon a storm takes them by surprise. Soon both women learn that their boat was sunk by the waves and that only one of the twins could be saved. But which of them? Next morning a boat approaches bringing one of the brothers. Rosa is happy, thankful to see her husband alive, but then the man claims to be Rafael. That night the survivor goes to bed with María.

One morning a fishing boat approaches to Isla de Lobos bringing the real Rafael alive, who wants his family back unknowing what his brother and his own wife have done. Besides, will Rosa tell him the true?