The main heroine, Katerina, and her friends again had to face denizens from the mirror world. Now the doppelgangers need her herself—more precisely, her blood—in order to pass through mirrors at any time. In turn, members of the Club of Cagliostro are also searching for a way to transfer into Zercalia: they are trying to restore Trianon, a magical artifact known since the times of Cagliostro, and to recreate a mirror machine. After reading the diaries of her disappeared father, Katerina learns not only about the misfortunes that befell him in Zercalia, but also about the existence of a secret connected to her birth. To learn the truth, meet her mother, and save her “crystallized” beloved, the girl decides to transport herself to Zercalia. But she isn’t alone. A terrible whirlwind brought on by demonic forces carries her friends there too. New adventures and trials await them there.