What Have You Done to Solange? (1972)

After several Catholic school pupils are murdered, a teacher who is having an affair with one of his students becomes a suspect. When other gruesome murders start occurring shortly thereafter, the teacher suspects that he may be the cause of them.

Directed by: Massimo Dallamano

Starring: Fabio Testi, Karin Baal, Cristina Galbó, Joachim Fuchsberger, Günther Stoll, Claudia Butenuth

Links: IMDb, Movie posters, Movie stills