An investigator arrives from Scotland Yard who is after the infamous Jack the Ripper. Meanwhile, Murdoch takes dancing lessons so that he can escort Dr. Ogden to a ball.

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.