After a long journey pursuing Vorontsov, D'Eon and the others arrive at Saint Petersburg. To obtain permission from Empress Tsaritsa Elizaveta to operate in Russia, D'Eon and Robin infiltrate a masquerade ball dressed up in women's clothing. Maximilien Robespierre, Cagliostro, and Lorenza approach Vorontsov and ally themselves with Grand Chancellor Bestuzhev, who intends to assassinate the Empress. Meanwhile, Durand and Teillagory are forcefully taken to see a veiled woman who is aware of this plotted assassination.