When an unknown assailant begins targeting innocent young females at a Catholic girls' school in London, an Italian teacher (Fabio Testi) with a fuzzy alibi becomes the authorities' prime suspect. Can he clear his name and find the real killer before his favorite student (Cristina Galbó) falls victim to the murderer? Massimo Dallamano directs this classic 1970s giallo with a score by Ennio Morricone, a film based on a story by Edgar Wallace.