Las cautivas (1973)

Wealthy Raimundo dies of a heart attack and the notary reads out his will that leaves all his estate and companies to his widow Luz, with the surprising clause that she will remain without a man for two whole years, during which his trusted attorney Arturo will be in possession of the whole patrimony. Being much younger than her late husband, Luz resents this clause that will keep her captive of a dead man for so long. Her attempts to seek release in the town's night spots aren't satisfying. Her maid, Lucia, starts an extortion scheme against her, menacing to denounce Raimundo's murder with venom, as Luz and Arturo were lovers. The faithful cook and the gardener are dismissed and Lucía literally takes her employer's image, clothes, and manners, forcing Luz to humbly submit to her progressively insane demands. The police accept the murder accusation Arturo makes against the maid; she is arrested and Arturo marries Luz. So, crime does pay. But the story does not end there.