The year is 1931, and something in London is very wrong. A recent patient at the asylum with a history of hunting monsters, Cadi Madoc has been asked to investigate a strange serious of murders despite the insanity her past encounters have left in her. Along with an inspector from Scotland Yard, an American newsman, and her Austrian baron, she joins a deadly race against a dangerous cult and their monstrous patron. The forces arrayed against them are inhumanly powerful, however, and what seems to be truth is only skin deep...