Oh, this “brave new world” that suddenly turned the European situation upside down after the Battle of Poltava! Nothing about it is new. All the same intrigues, the same redistribution of spheres of influence, all the same secrets... And one of these secrets was the mystery of the origin of two million thalers captured from the Swedes near Poltava by the Russian army. After all, when they calculated the debit and credit, the numbers did not add up... So who is the mysterious sponsor who so generously lent to Charles the Twelfth? Who is this strange chevalier who arrived in the retinue of the French envoy and what are his goals? This is what “sister Katerina” has to find out. She changed her uniform to the dress of a court lady, learned manners and dancing, but in essence she remained a soldier. And strange events are happening in still young St. Petersburg. At first glance, this is ordinary economic sabotage, and even associated with the most criminal acts. But as soon as Pyotr Alekseevich was able to begin a normal investigation, it turned out that there were too many... interesting things.