Former princely swordsman Alexander seemed to have finally found peace: home, family, work in the forge. But one day the merchant Rogul persuades him to go with goods to Tver and take over the protection of the trade convoy. It seemed like nothing special, just an ordinary trip along calm Russian roads, just back and forth. But not this time. This time he will fall into the thick of things. And the former swordsman will have to remember all his skills: both a warrior-fighter and a detective. And he will have to receive a task from Prince Ivan Danilovich Kalita - to find a relic, more valuable than which there has never been in Rus' and, perhaps, never will be, for the possession of which any prince is ready to do anything...