Os Amores da Pantera(1977)

During an orgy of millionaires, a woman is mysteriously kidnapped and killed. The crime causes quite a stir in local society, as the investigations points to a very known addicted playboy. Although it's never said, the film is vaguely based on a real case happened in 1975, when socialite Ângela Diniz was killed by her lover Doca Street, in Búzios, Brazil.