Three sisters run brothels protected by the authorities, abuse and prostitute young women under the false pretense of employing them as servants.

In the mid-1970s in the Mexican state of Guanajuato, authorities discover a clandestine burial ground full of the corpses of murdered prostitutes. The suspects are three sisters known as "Las Poquianchis" They were very religious, but they owned brothels and recruited poor girls with false promises of jobs, then forced them into prostitution, and killed many of then,—jairhcastillo