In Regency England, Cascabel Gray disguises herself as her twin brother Pom to attend Oxford University, where she wishes to study medicine. Her plans are upended, however, when she receives a letter from Charles Lafleur, a member of infamous secret society the Rogues Club, blackmailing her to keep her deception secret ...But when Lafleur is found dead, the plot thickens – and Cascabel becomes a prime murder suspect. She joins the Rogues Club to conduct an investigation of her own, and is quickly swept into a life of gambling and vandalism ...To survive in Oxford's high society, she must switch between her male and female personas, attracting the attentions of both fellow student William Grenville and a chambermaid known as Mouse – and even attending a ball with an Austrian prince. Can she find a way to balance her double life and clear her name, before she loses everything?