Thirty years ago the two founders of the Rose and Raven Society disappeared while investigating a mysterious stranger called the Jumping Jack, a fiend whose mechanical teeth, glowing orange eyes, and fiery breath had been terrorizing young ladies in the city. The Jumping Jack also disappeared not long after the founders. Now, it's 1922 and Horacio (H.W.) Wolveridge and his neurotic partner, Davor Nikolic, have been tasked to solve the case of the Jumping Jack since sightings of the man have resurfaced. A loner, Horacio is loath to have a partner, especially one such as Davor, who is afraid of dust and runs from every errant noise. However, Davor is a brilliant inventor and scientist, something Horacio finds useful. Together, they must work past their differences and find out who the Jumping Jack is and what happened to the founders so many years ago.