The tragic story of Marianela, a poor and ugly girl, and Pablo, a man born blind who is in love with her.
The action takes place between Socartes, mining town, and Aldeacorba, agricultural area, where Don Francisco Penáguila lives with her son Pablo.
Nela, meanwhile, a poor orphan who lives with the family of the mine foreman, mister Centeno, despised by all, incapable of anything useful, just feel joy accompanying Pablo.
But now comes to Socartes the engineer's brother, Don Teodoro Golfín, famous ophthalmologist, and one of the reasons for his trip is to try to heal Pablo.
Fortuna will not end, unless Pablo get the sense of sight, in which case the marriage would be held with his cousin Florentina, beautiful girl, daughter of Manuel.