Santa has been a recurring theme in Mexican media since the early days of silent movies, and later it was the very first script produced with sound. This version was produced and broad casted by Televisa in the late 1970s displaying similar production values to other so-called "historical" series produced by the Mexican media monopoly (like El Carruaje, El Vuelo del Águila, and so forth). It seeks to be as faithful as possible to Federico Gamboa's novel.
Santa is the story of a young mestiza (played by a youthful Tina Romero) who is forced into prostitution after falling in love with a middle rank officer of the Mexican Army who is unwilling to marry her and her slow and painful evolution into one of Mexico City's most demanded high-end prostitute, her involvement with a successful bullfighter, and her fall in disgrace.
There are several versions of the story, but I believe this is the best rendition, unfortunately is almost impossible to legitimately get it on DVD or VHS.