Cwen City, Everstrom. Capital of the modern world. Home to Undine National Library, where the biggest collection of knowledge is gathered and looked after by experts in all fields.
Suzzen and Rogier —two teenage residents at the library— discover along with neurotic History expert Arabelia that books are being stolen and replaced by forged copies, which will lead them to begin a dangerous investigation. Meanwhile, Suzzen is researching about her parents, whom she barely remembers; and though she seems to be in the right place, she is having a hard time finding anyone who would tell her anything about them…