"What Have You Done to Solange?" (original Italian title: Cosa Avete Fatto a Solange?) is a 1972 Italian giallo film directed by Massimo Dallamano. Renowned for its intricate plot, atmospheric tension, and striking cinematography, the film stands out as a classic of the giallo genre, blending elements of mystery, horror, and psychological thriller.

The story revolves around Enrico Rosseni (Fabio Testi), an Italian teacher at a Catholic girls' school in London. Enrico becomes a prime suspect in a series of brutal murders targeting the school's female students. Complicating matters, he is involved in an affair with one of his students, Elizabeth (Cristina Galbó), who becomes a witness to one of the murders.

As the investigation progresses, Enrico, determined to clear his name, delves deeper into the mystery. He discovers that the killings are linked to a tragic event involving a former student named Solange (Camille Keaton). Solange's past holds the key to understanding the motive behind the murders, leading Enrico on a dangerous quest for the truth.

Dallamano's direction is characterized by a masterful use of suspense and a keen eye for visual detail. The film's cinematography, handled by Joe D'Amato, captures the stark and eerie atmosphere of the London setting, with a mix of urban and rural locations adding to the sense of unease. The haunting musical score by Ennio Morricone further enhances the film's chilling mood, complementing its suspenseful and dramatic moments.

"What Have You Done to Solange?" explores themes of guilt, repression, and the dark secrets that lie beneath the surface of seemingly respectable institutions. The film's narrative intricacies and character complexities contribute to a compelling and unsettling story that keeps the audience guessing until the final revelation.

The performances, particularly by Fabio Testi and Karin Baal (who plays Enrico's wife, Herta), add depth to the film's emotional and psychological landscape. Camille Keaton's portrayal of Solange, though limited in screen time, is pivotal and haunting, leaving a lasting impression.

Overall, "What Have You Done to Solange?" is a standout example of the giallo genre, distinguished by its sophisticated storytelling, atmospheric tension, and psychological depth. It remains a significant and influential film, appreciated for its artistry and its exploration of the darker facets of human nature and societal norm