A tale of two families, the Mendozas and Alzagas, faced for generations by the water of a river separating their adjoining properties. Old grudges reappear when the two heirs fall in love.
Father Luis Lastra is a young priest who does his job in the village of Peñascosa. There he meets Marta, a beautiful parishioner very interested in religious matters, so much that she convinces the priest to accompany her to the convent to become a cloistered nun. Along the way, they have to stop...