Valerie Durand has two equally strong passions: genealogy and programming. Thanks to the combination of these interests and her analytical mindset, the girl landed her dream job at the Heraldry Office of France. There, she was immediately given a very important task: to prove that the famous businessman Etienne Morreau belongs to an ancient aristocratic family. But it isn’t that simple: it seems that someone cleaned up the information both on the Internet and in museum archives. While working through the family archives at Etienne Morreau’s mansion, Valerie discovered that there is a lower floor in the house, access to which is closed. That wouldn’t be suspicious—except that a possible ancestor of Etienne is the ominous Gilles de Rais, Bluebeard, who was accused of witchcraft, of numerous bloody human sacrifices, and of being burned…