Anita Drögemöller und die Ruhe an der Ruhr (1976)

Anita Drögemöller has transformed herself from a small-time street prostitute into a luxury call girl. But one day she finds her former pimp dead in her apartment with a broken neck. Chief Inspector Langensiepen takes up the investigation and discovers an impenetrable web of sex, lies, raison d'état and murder.