The events take place in 1945, a few months before Victory Day. The Nazi army is preparing to repel an attack by Soviet soldiers in East Prussia, which could prove fatal for the fascists. The front line is approaching Königsberg. The German leadership orders the city to be turned into an impregnable bastion that will serve for long-term defense. A few weeks before the offensive, soldiers Leshya Bobrikov and Lenya Filatov infiltrate the city to carry out a sabotage mission.