The Great Patriotic War. 1945 year. There are fights for the city on the Danube. The river is mined by the Germans, and this fetters the action of our troops. In addition, a city with a million people was left without food. And downstream are Soviet food barges. The command instructs the reconnaissance group a difficult and dangerous operation — to obtain from the enemy a map of the mined sections of the river, which requires penetrating into the city captured by the Germans.