In 1875, Inspector Ol'Barrow of Dover's borough police is still coming to terms with the advent of radio dramas when he is confronted by a series of crimes that defy explanation. During their investigation, he and his colleague Bigsby come eye to eye with an assassin with otherworldly origins. Spurred on by his sense of duty and a desire to redeem himself, Inspector Ol'Barrow encounters a clandestine organization called The Association of Ishtar...