After witnessing their parents' murder, Odile and Gréluchon Ricau have come to Paris to seek refuge, only to find themselves living in the dark catacombs in a city on the brink of war. Luckily, Odile has a advantage and a bizarre birthright. she is descended form the cagots, a much-despised race whose women were reputed to be withches. Were they, in fact? This is the question Odile must answer as her brother's health quickly declines. But soon she meets the succesful Doctor Henry Jekull, and Odile discovers he might have the means to help heal her brother, get her off the streets, and discover the secrets of her ancestors. But Doctor Jekyll's help will come at a price. Is Odile willing to take the risk?