Amenaza en la sombra

This undisputed horror classic is set in Venice, where an English couple tries to come to terms with their daughter's death. While there, they are approached by an alleged medium, who claims that the little girl's ghost is trying to communicate with them, thereby causing a rift in the couple, who are torn between their hope and their skepticism. Meanwhile, a series of atrocious murders are filling the canals with corpses.