Surrounded German armies near Moscow are not going to surrender. The supply of troops in the Moscow pocket is being ensured by the Luftwaffe using transport aircraft. To rescue the Army Group “Center,” the Wehrmacht generals amass forces and prepare a debloacking strike using chemical weapons. Under these circumstances, Lieutenant Colonel Nagulin receives an order to stop the flow of supplies to the Germans through the “air bridge” created by Göring. While Nagulin hunts for transport “Junkers,” the Abwehr sets another trap—this time for him.