A savage murder, seemingly at the jaws of a wild beast, leads Murdoch into the mysterious worls of North American shamaism and lycanthropy. While searching for a reational explanation, Murdoch is forced to choose between Enid and Dr. Ogden.

While investigating a murder, Murdoch find himself teamed with a North West Mounted Policeman whose methods and mannerisms are strikingly similar to this own -- perhaps too similar? Murdoch hope to rekindle his relationship with Dr. Ogden -- but is it too late?