The Pyx (1973)

 The Pyx (1973)

aka

The Hooker Cult Murders

The story, based on a novel by John Buell, concerns a prostitute, Elizabeth Lucy (Black), who is found dead after a drop off of a high-rise. She is clad only in lingerie, wearing an upside down cross and holding a pyx--a small, metal container used in Catholicism to bring consecrated hosts ("hosts" are the symbolic pieces of bread used in the Eucharist, or sacrament) to the sick. Jim Henderson (Christopher Plummer) is the police sergeant who ends up investigating the case. The film continually bounces back and forth from Henderson's investigation, which involves the more visceral crime scenes, as infrequently as those occur, and flashbacks to Lucy's immediate past, which involves more of the "sex" and drugs material, as infrequently as that occurs. The crux is that both Lucy's immediate past and Henderson's investigation are leading to the same climax--Lucy is moving forward in time while Henderson is roughly working his way back. (IMDB Brandt Sponseller)

A detective investigating the death of a heroin-addicted prostitute uncovers evidence pointing to the existence of a murderous devil cult. V&D