The French Sex Murders

Francine (Barbara Bouchet) a prostitute in a french brothel is assassinated, the prime suspect is one of her regular clients, even though the alleged perpetrator claims his innocence he is sentenced to death but manages to escape custody, during the high speed chase he suffers a fatal crash. Soon afterwards the witnesses that testified against the suspect are murdered by an black glove wearing individual in bloody ways. Who is behind the mysterious killings?