A twisted killer, playing a vicious game. And only he knows the rules...Twenty years ago, DCI Willie Dowd retired on a high, having stopped an elusive serial killer. Dowd killed Colin Harris in self-defense. Case closed.Now, DCI Harry McNeil comes across evidence that suggests that maybe Harris wasn't guilty after all.Willie Dowd is in a home now, suffering from Dementia. He doesn't know his family members at times, and certainly can't remember Colin...