During the first Carlist war, Beatriz, daughter of an Isabeline colonel, secretly marries a Carlist captain who gets killed. Years later she returns to Rubiercos, an Asturian lost hamlet where she left her daughter, to find a troubled village where traditional rural lifestyle is threatened by the emerging coal mining industry and a new way of life darkening the river waters.

Asturias, 1839. Durante la primera guerra entre carlistas e isabelinos, Beatriz, la hija de un coronel isabelino, casada en secreto con un capitán carlista, se ve metida en una dramática aventura en la que se enfrentan su padre y su marido.