What Have You Done to Solange?

What Have You Done to Solange? (Italian: Cosa avete fatto a Solange?) is a 1972 giallo film directed by Massimo Dallamano and starring Fabio Testi, Karin Baal, Joachim Fuchsberger, Cristina Galbó, and Camille Keaton. The plot follows a series of violent murders occurring at a Catholic girls' school in London, where a young student has gone missing. The film is a co-production between Italian production companies Italian International Films S.r.l., Clodio Cinematografica and West German studio Rialto Film. It was released in Germany as Das Geheimnis der grünen Stecknadel ("The Clue of the New Pin"), where it was promoted an Edgar Wallace krimi film.