A well-known collector of impressions Andrey Ponkratov will travel to the Pskov lands, where the famous Battle of the Ice took place almost eight centuries ago. But where exactly did that battle take place? What does the Raven Stone look like, indicated in the annals as the main guideline for finding the exact place of the fight? Andrey Ponkratov will find out. And the direction of the search will be prompted by the birds depicted on the sketch of Petrov-Vodkin.