Spring 1945. Nazi Germany's armed forces prepare to repel the Soviet onslaught in East Prussia. The front line is approaching Königsberg. The German command gives the order to turn the city into a fortress, preparing it for a long defense.
A few weeks before the Red Army advance, Alexei Bobrikov and Leonid Filatov are ordered to infiltrate the city to carry out sabotage tasks, the most important of which is to find a weak point in the fortifications to maximise a bloodless assault.
Leonid and Alexei find themselves in a besieged city and embark on probably the most cunning and deadly reconnaissance operation of their lives. And helping them organise the "perfect assault" will be an unexpected ally...
(Channel 1)