Boom! (1968)

Movie version of playwright Tennessee Williams' "The Milk Train Doesn't Stop Here Anymore" involves very wealthy Flora "Sissy" Goforth (Dame Elizabeth Taylor), supposedly dying, and living in a large mansion on a secluded island with her servants and nurses. Into her life comes a mysterious man, Christopher Flanders, a.k.a. "Angelo Del Morte" (Richard Burton) and Bill Ridgeway, The Witch of Capri (Noël Coward). The mysterious man may or may not be "The Angel of Death".