Throughout the movie, the focus is primarily on Marzia, who becomes the main target of the killer. She is deeply traumatized by the death of Flavia and Fabio and becomes increasingly nervous and paranoid as more and more people around her are killed. Marzia's lover, Carlo, is a minor character who is also caught up in the deadly game, but ultimately meets a gruesome end.
As the investigation into the murders deepens, the police begin to suspect Flavia's stepfather, who had a motive to kill Fabio due to his abusive behavior towards Flavia. However, as they dig deeper, they discover that the killer is actually more closely linked to the group of friends, including Marzia and Carlo.
The film's plot is heavily influenced by the giallo genre, which is known for its use of graphic violence and intense psychological themes. Giallo in Venice received mixed reviews upon its release, with some critics praising its suspenseful atmosphere and haunting score, while others criticized its gratuitous use of violence and sexual content.
Overall, the film is a dark and disturbing exploration of sexual violence, revenge, and obsession, with a shocking and gruesome climax that is sure to leave audiences reeling.