A Blade in the Dark on AllMovie

This horror-thriller from director Lamberto Bava stars Andrea Occhipinti as Bruno, a composer who becomes involved in a frightening series of murders while staying at an isolated villa. The story turns on a scene in the horror film Bruno is scoring: a young child, taunted by cruel bullies, descends into a dark cellar after a bouncing tennis ball. The kids hear a scream and the ball bounces up to them, leaving bloody tracks on the wall. Pretty Sandra, Bruno's director, explains that her inspiration was the childhood of Linda, the villa's previous tenant, but there is something far more sinister going on. Anyone who has seen Psycho probably has a good idea what that "something" is, but the plot is really incidental.