East German film about the history of Red Orchestra, a real life German pro-Soviet spy ring created after the rise of Hitler that turned into a resistance movement led by a leftist Nazi officer, Harro Schulze-Boysen, and Arvid Harnack.
In Berlin, Lieutenant Yartsev's infantry and Tzvetaev's battery fight their way in the U-Bahn. Captain Neustroev's company is selected to hoist the Victory Banner atop the Reichstag.