A rich but lonely woman, Frances Austen, one day invites a boy from a nearby park to her apartment and offers to let him live there.　　Robert Altman's sadly neglected film that, along with his later "Images", fits into the unconventional psycho-thriller mold. A bizarre story with Sandy Dennis as a spinster who takes in a handsome young man (Michael Burns) who is pretending to be mute. She imprisons the boy and supplies his every need, including a prostitute (Luana Anders), whom she goes out and brings home for Burns' pleasure.…