The heroes of The Gunsmith - Svyatoslav and Tatyana - burst into the slow and gloomy world of the late Middle Ages with the knowledge and skills of the late 20th - early 21st centuries. Accustomed to living in a completely different rhythm, they desperately needed followers, since it was impossible to build a new empire together. Human life is fragile, like a twig, but if you make a broom from thin twigs and fasten it with a strong strap, then with such an instrument you can sweep away the dope of theology, medieval prejudices, and create a reliable system for storing state secrets. By violating the basic law of learning: from simple to complex, the development of science and technology in the rest of the globe can be blocked for a long time. After all, it is impossible to copy the proton exchange membrane by scientists of the 17th century. This requires knowledge of the 21st century and all previous ones. And since it exists and works in one country, the best brains of the “Western partners” will fight against this “black box” without any success. The empire created on the shores of the Baltic and Ladoga, after some time spread across all continents. The heir grew up, and he naturally had questions about the nature of Vyborg’s power. The time has come for him to learn the secret of the universe.