In Victorian London, after his life is saved by a young physician, a thief utilizes the knowledge he gains in prison and from scientific lectures he attends as the physician's case study exhibit to create a new, highly successful, double life for himself. In this tale of thievery and deceit, tweens will be drawn to the main character's desire to reinvent himself, and eventually turn away from his life of crime to one of luxury and good. The author creates a level of intrigue with her portrayal of his dual personalities, and shows Montmorency as he progresses into a mindset where he can use his skills as a thief for the greater good.