Sergei Ivanovich became so accustomed to the persona of a guest from Pogost na More that he began to seriously think about a career as a merchant. However, Prince Mstislav's problems and debts did not disappear by themselves, and he was forced to resolve a lot of conflicting problems. His life is full of intrigue, but this does not stop him from developing technology and building his own fortress. Like circles from a stone thrown into water, goods from Prokhor are spreading across Rus', hurting the interests of the powers that be. Guided by the logic of the 20th century man in the street, the “prince” commits a number of reckless actions, putting his life and the lives of those who trusted him in serious danger. Will he cope? Or merciless time will crush an insignificant grain of sand trying to run much faster than others.