Based upon a true story, the movie centers on the German communist Robert, a "Kapo" in a concentration camp. When some Polish children are brought to the camp, Robert tries to save them from certain death. Due to his efforts they are being trained as masons and become part of his construction gang. Nevertheless, the boys, and mainly the clever Janusz, are very suspicious of Robert. They have already experienced too much evil and do not want to trust anybody – least of all a German.

This film is the second of a two-part historical and biographical portrait of the communist politician and anti-fascist Ernst Thälmann. Autumn, 1918: Somewhere on Germany’s western front, Ernst Thälmann, age twenty-four, is calling on his fellow soldiers to put down their guns and join him in the communist struggle at home. When Hamburg’s Police Commissioner blocks a much-needed food shipment to the workers of Petrograd, Ernst battles to see it allowed through. Until his murder on August 18, 1944, Ernst remained true to his political convictions in the face of many setbacks.