In Wales, in 1882, murders took place not far from Cardiff, in a region still wooded and wild, a series of wild murders had been taking place for some time and the local police had been unable to get their hands on the responsible for all of this. Scottland Yard decides to send some agents there, they will realize that the murderer is a wild werewolf who can be any of the citizens ! But especially since the creature was released by someone who seems to have dark plans and therefore this investigation will be the most terrible for each of these belligerents.