There's a beautiful full moon in the sky and Toronto may have a lycanthrope - a werewolf - on the prowl. The first victim is a prominent banker who, along with his two large dogs, is found mauled to death in the warehouse district. His death is soon followed by the death of several others and information points to the fact that the men all knew one another and had recently been on a hunting trip together. The police use the services of a native tracker, Jimmy McLeod. The young man aspires to be a police constable but race prevents that from ever happening. In his personal life, it is apparent to Enid, even if it isn't to Murdoch, that he still harbors feelings for Dr. Ogden. She tells him that the time has come for him to make a commitment to her and her son Alwyn or end their relationship.