Five Dolls for an August Moon

Five Dolls for an August Moon is a 1970 Italian giallo film directed by Mario Bava. It concerns a group of people who have gathered on a remote island for fun and relaxation. One of the guests is a chemist who has created a revolutionary new chemical process, and several of the attending industrialists are eager to buy it from him. Business problems become moot when someone begins killing off the attendees one by one.