Three young women fall victim to a sexual pervert and are assaulted. The prime suspect is a 17-year-old boy who has grown up in almost complete isolation in a remote area near Matlock. Notes: Features a ‘teaser’ before the opening titles, which were used from ep. 156 onwards. This episode has number 158 on the tape leader (as does actual ep. 158 'By Gones Be By Gones'). By production order, it should be numbered 157A, and ep. 157A ‘Dancing Class’ (which has ep. 151 on the tape leader) should be numbered 151.