An island murder mystery, so soon before Glass Onion comes out. Good lighting and fashion, the camera getting up in everyone’s business with help of a zoom lens, music going as big as possible… poor acting and dialogue and logic and dubbing.
The Professor has a secret formula, three other guys want him to sell it to them, then everybody starts turning up dead and being sent to the meat locker. The Professor (who also played a professor in Devil Fish) dies, of course, his widow Trudy scheming with Bad Hair Jack, then they shoot each other over the precious microfilm. I lost track of how the island-prowling loner girl was related to anyone else – played by the daughter who hung out with dangerous hippies in A Lizard in a Woman’s Skin – but she survives and gets all the money.