Black Sunday presents itself as a gothic horror movie told in black and white, centering on a story of vengeance carried out by an executed woman and those attempting to prevent it. The storyline is acceptable; it’s not remarkable, but it serves its purpose for the film. The characters and other basic components are adequate too. So, what makes this movie worth seeing? Director Mario Bava excels at creating a palpable sense of place. The musical score accompanying the film is truly impressive. The black-and-white photography enhances the mood considerably, as does the visual style employed. The cinematography stands out particularly well; the filmmakers utilize extended shots effectively. There are numerous instances where these longer takes don't directly advance the narrative but instead contribute to the unsettling atmosphere and overall feeling of dread. The film also features some rather graphic moments, though it’s not in the vein of a gore-filled movie. These scenes are appropriately integrated and enrich the viewing experience without overshadowing everything else. Ultimately, if you're looking for an atmospheric horror film and aren't overly concerned with a complex plot or well-developed characters, Black Sunday might appeal to you.

Source on TMDB