In this crime thriller, Leslie Steckler (Peter Firth) is an inoffensive, polite and very quiet man. He does, however, have a particular animus against blondes wearing white. In fact, among that small group of women, he is a cold-blooded serial killer, instead of the meek dentist he usually appears to be. He is looking for someone to tell his story to, and when he discovers that the (brunette) writer Ellen Carter (Harriet Robinson) has murdered her husband, he feels that he has found a perfect person. It helps, of course, that her novelistic specialty is serial killers. However, Inspector Taylor (Don Henderson) of Scotland Yard is on Ellen's case, and will soon be on Leslie's.