The quick red fox (1964)

The Quick Red Fox is a gripping study in blackmail. The victim: gorgeous Lysa Dean, whose name on a picture means big box-office money -- but whose face in the set of house-party pictures somebody mails to her means the end of her career. Blackmail is always an ugly business, but Travis McGee is particularly concerned about the note with the photographs, which sounds like the spewings of a sick, perverted mind. McGee's first objective is to locate the nine other people who appear in the pictures. Did one of them know that their swinging party was only 300 feet from a telephoto lens? Then, as he digs for the answer, these sun-loving, fun-loving, highly photogenic men and women begin to turn up dead.