Plenty of campy humor enlivens Antonio Margheriti's tame giallo thriller about murders at a prestigious girl's boarding school. Mark Damon (The Fall of the House of Usher) is the studly riding instructor having an affair with one of the students (Eleonora Bron), an heiress who is the killer's primary target. Michael Rennie (The Day the Earth Stood Still) investigates the crimes, as women are murdered in showers, thrown into pits of quicklime, and terrorized in aviaries. Other than copping out by featuring yet another overly obvious transvestite killer, it's not half bad. Genre stalwarts Luciano Pigozzi and Marisa Longo also appear.