In Victorian London, after his life is saved by a young physician, a thief utilizes the knowledge he gains in prison and from the scientific lectures he attends as the physician's case study exhibit to create a new, highly successful, double life for himself. When a petty thief falls through a glass roof while fleeing from the police, it should have been the death of him. Instead, it marks the beginning of a whole new life. Soon he has become the most successful and elusive burglar in Victorian London, plotting daring raids and using London's new sewer system to escape. He adopts a dual existence to fit his new lifestyle, taking on the roles of a respectable, wealthy gentleman named Montmorency and his corrupt servant, Scarper.