The Mad Executioners

This quirky crime thriller has an intrepid Scotland Yard inspector tackling two seemingly disparate cases. He is officially assigned to investigate an underground society of vigilantes who take the law into their own hands, trying criminals in their own "Star Chamber"-style kangaroo court. On his own initiative, he is also pursuing a serial sex-killer who decapitates his victims. Felmy's dogged devotion to this case turns out to be personal, since his sister was among the killer's victims. (allmovie.com)