The soap itself was broken into two halves: the first part dealt with the rags to riches story of Mariana Villareal (played superbly by Castro), and the second part dealt with her struggle to recover her long lost son. The overall message seemed to be: even if you were rich and had the world at your feet, you were not necessarily happy, and therefore "The Rich Cry Too", because money isn't everything.
I personally liked the first part better than the second part, but all in all, this was a superior work than all the others one sees on T.V. nowadays. Back then, in 1979/80, it ruled! I hope they will show it sometime again in the U.S.