Más negro que la noche, also titled "Blacker Than Night" is a 1975 Mexican horror film, written and directed by Carlos Enrique Taboada.
Plot[]
The film is about four women that move to a creepy house, inherited by one of them from an old aunt; as a condition, they must take care of the aunt's pet, a black cat. Once the pet is mysteriously found dead, a series of bizarre murders begins.