Seven Blood-Stained Orchids (1972) on Netflix

A woman, a survivor of a failed murder attempt by a person dubbed "The Half-Moon Killer" by the police, and her husband must find the connecting thread between herself, six other women, and the killer before the killer strikes at her again.

—smcarter

A serial-killer is attacking women in Italy, leaving a silver moon near their corpses. While traveling to Paris by train with her fiancé, the famous designer Mario Gerosa, Giulia Torresi is assaulted by the serial-killer in her cabin. Police Inspector Vismara decides to hide that Giulia has survived to protect her. Mario decides to investigate the victims and finds that six women had been in the hotel Giulia owned in the past. They travel expecting to save the women that have not been attacked before the killer finds them.

—Claudio Carvalho, Rio de Janeiro, Brazil