¿Por qué mataron a Betty si era tan buena muchacha?

Cristina Granados gets a job in a refined restaurant called Orense, owned by the wealthy Alarcón family. While doing his job, he finds a woman's skeleton in one of the restaurant's cellars. After reporting the fact, Cristina mysteriously disappears. It is later discovered that the skeleton found is that of a seemingly harmless woman named Betty, who worked as a waitress in Orense. Magola, Cristina's mother, ends up being employed in the same restaurant to try to find the truth about her daughter's disappearance.